AS&E v. Viken Detection: Federal Circuit Affirms Backscatter Portal Patent Unpatentable
American Science and Engineering’s US8300763B2, covering spatial sequenced backscatter portal technology, was challenged by Viken Detection and found unpatentable. The Federal Circuit affirmed that ruling in a per curiam decision under Rule 36, ending the dispute after 742 days without a written opinion.
Federal Circuit kills AS&E backscatter portal patent in Rule 36 affirmance
American Science and Engineering, Inc. (AS&E), a developer of X-ray inspection and security screening systems, appealed a ruling that its patent US8300763B2 — covering a spatial sequenced backscatter portal system — was unpatentable. The appeal, docketed as Case No. 23-2101 at the Court of Appeals for the Federal Circuit, was filed on 30 June 2023. The opposing party, Viken Detection, Corp., is a competitor in the security detection space.
The Federal Circuit disposed of the case on 11 July 2025 with a per curiam affirmance under Federal Circuit Rule 36, a summary procedure used when the court finds the lower tribunal’s reasoning sufficient and no new legal question warrants a written opinion. The basis of termination is recorded as ‘Unpatentable,’ confirming that US8300763B2 does not survive validity scrutiny. AS&E receives no patent protection for the claimed backscatter portal technology.
The 742-day duration from filing to disposition is consistent with standard Federal Circuit appellate timelines for patent validity appeals. A Rule 36 judgment is notably terse — it forecloses further argument at this level but provides no published reasoning that either party can use in future proceedings. What specific claim elements or prior art drove the unpatentability finding remains entirely shielded from the public record, which is itself a commercially significant data gap for the sector.
Filing to Unpatentable in 742 days
742 days from filing to Federal Circuit disposition — above median for Rule 36 affirmances
Federal Circuit affirms: what the unpatentability ruling means for both parties
Rule 36 affirmance: the lower decision stands without written opinion
A Federal Circuit Rule 36 judgment means the appellate panel found no reversible error in the decision below and concluded no written opinion was warranted. The lower tribunal’s reasoning is adopted in full. Crucially, a Rule 36 affirmance carries no published precedential value — it cannot be cited as authority — but it is final and binding on the parties. For AS&E, all appellate avenues at this court level are now exhausted.
Affirmed — no reversible errorUS8300763B2 is unpatentable: AS&E loses exclusivity over backscatter portal claims
With the affirmance, the unpatentability finding against US8300763B2 is final at the Federal Circuit level. AS&E can no longer assert this patent defensively or offensively against competitors in the spatial sequenced backscatter portal space. The company’s remaining enforcement options are limited to any surviving patents in its broader portfolio. A petition for certiorari to the Supreme Court is theoretically available but historically unlikely to succeed in patent validity disputes of this type.
Patent invalidated — enforcement barredViken Detection prevails: the backscatter portal space clears of this IP obstacle
Viken Detection successfully defended the unpatentability ruling on appeal. With US8300763B2 now affirmed as unpatentable, Viken and any other market participant can operate in the spatial sequenced backscatter portal technology space without risk of infringement claims under this patent. The Rule 36 disposition also means no published opinion exists that might reframe the prior art landscape — a practically neutral outcome for Viken’s own patent strategy.
Challenger wins — patent clearedX-ray security screening sector: a core AS&E patent removed from the competitive map
US8300763B2 covered spatial sequenced backscatter portal technology — a detection method relevant to security checkpoint and cargo screening markets. Its invalidation removes a litigation risk for competing vendors and potentially lowers barriers to entry for players developing backscatter-based security solutions. Competitors should audit remaining AS&E portfolio patents for continued exposure, as AS&E may seek to enforce related or continuation patents to compensate for the loss of this asset.
IP barrier reduced in security screeningFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | American Science and Engineering, Inc. | Company | X-ray security inspection technology company — holder of US8300763B2Search in Eureka ↗ |
| Defendant | Viken Detection, Corp. | Company | Viken Detection, Corp. — security detection technology competitor to AS&ESearch in Eureka ↗ |
| Plaintiff counsel | Aaron E. Hankel | Attorney | Counsel for American Science and Engineering, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Kyle E. Friesen | Attorney | Counsel for American Science and Engineering, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Shook Hardy Bacon LLP | Law Firm | Representing American Science and Engineering, Inc.Search in Eureka ↗ |
| Defendant counsel | Christopher S. Schultz | Attorney | Counsel for Viken Detection, Corp.Search in Eureka ↗ |
| Defendant law firm | ArentFox Schiff LLP | Law Firm | Representing Viken Detection, Corp.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The Federal Circuit’s order — ‘AFFIRMED. See Fed. Cir. R. 36.’ — is among the most compressed dispositions the court issues. Under Rule 36, the panel (Chief Judge Moore, Judge Linn, and Judge Cunningham) concluded the lower tribunal committed no reversible error and that no published opinion was needed. The appellate standard typically applied is whether the lower tribunal’s factual findings were supported by substantial evidence and its legal conclusions reviewed de novo. No reasoning is disclosed, which means the precise grounds for the unpatentability finding — whether anticipation, obviousness, or another basis — remain outside the public record.
US8300763B2 — Spatial Sequenced Backscatter Portal Technology
US8300763B2, filed under application number US12/841401, covers a spatial sequenced backscatter portal — a security screening technology that uses sequenced X-ray backscatter imaging to detect concealed threats on persons or in cargo passing through a portal configuration. Backscatter X-ray technology creates images from radiation reflected back toward the source rather than transmitted through the subject, enabling detection of organic and low-density materials that transmission-based systems may miss. The patent was held by American Science and Engineering, Inc., a pioneer in X-ray inspection systems.
In the security screening and border inspection market, backscatter portal patents represent high-value IP assets given their deployment in airports, government facilities, and cargo checkpoints. The invalidation of US8300763B2 removes a competitive moat that AS&E likely used — or could have used — to restrict competitor product development in this configuration. For Viken Detection and other vendors, this outcome may signal broader freedom to operate around sequenced backscatter portal architectures, though the absence of a published opinion means claim-level clarity remains elusive. R&D teams should monitor the AS&E patent family for active continuation grants.
Should you run an FTO against US8300763B2 and the AS&E backscatter portal family?
Any company developing, manufacturing, or selling backscatter X-ray portal screening systems should assess exposure to the AS&E patent portfolio. While US8300763B2 has been affirmed as unpatentable, AS&E’s broader patent family — including any continuations or divisionals stemming from application US12/841401 — may cover overlapping technology with surviving claims. Relying solely on this Federal Circuit affirmance without a full family-level FTO creates residual risk that is commercially unjustifiable before a product launch or procurement contract.
PatSnap Eureka’s FTO Search Agent can map the full patent family around US8300763B2, identify surviving related applications, flag prosecution history estoppel indicators, and surface prior art that influenced the unpatentability finding — even without a published Federal Circuit opinion. For R&D and product teams in the security screening space, running a structured FTO against the AS&E backscatter portal family now — before further continuation grants issue — is the lower-cost, lower-risk path.
Run a freedom-to-operate analysis on US8300763B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit appeals: X-ray security and backscatter imaging patent validity
Federal Circuit cases involving X-ray backscatter and security screening patent validity challenges, including Rule 36 affirmances and IPR appeal outcomes in the security technology sector.
What this case signals for the X-ray security screening IP landscape
A Rule 36 affirmance of unpatentability at the Federal Circuit is a decisive, if silent, outcome. The backscatter portal IP field just shifted.
Rule 36 disposals leave no roadmap — audit the surrounding portfolio immediately
Because the Federal Circuit issued no written opinion, neither the invalidating prior art nor the defective claim elements are disclosed. Companies operating in the backscatter portal space cannot rely on this ruling to understand the full scope of AS&E’s remaining exposure. A proactive audit of AS&E’s surviving patents — including continuations of US8300763B2 — is the only defensible response.
Unpatentability affirmance signals vulnerability in the original prosecution strategy
An IPR or validity challenge reaching affirmance at the Federal Circuit typically suggests the claims were over-broad, insufficiently distinguished from prior art, or both. For R&D teams designing around the spatial sequenced backscatter portal space, the invalidation suggests more design freedom than previously assumed — but surviving AS&E patents should be verified before any product launch.
American v Viken — key questions answered
A Rule 36 affirmance means the Federal Circuit found no reversible error in the lower tribunal’s unpatentability ruling and issued no written opinion. The decision is final and binding on the parties but carries no precedential value and cannot be cited as authority. For US8300763B2, this means the patent is confirmed unpatentable at the Federal Circuit level.
The Federal Circuit affirmed the basis of termination recorded as ‘Unpatentable,’ which confirms the patent did not survive the validity challenge brought by Viken Detection. AS&E’s remaining options are limited to a Supreme Court certiorari petition, which is statistically unlikely to be granted in patent validity matters, or assertion of related patents in its portfolio.
A spatial sequenced backscatter portal uses sequenced X-ray backscatter imaging to screen persons or cargo for concealed threats, generating images from reflected radiation rather than transmitted X-rays. This makes it effective for detecting organic and low-density materials. The patent was commercially significant because it potentially restricted competitor product development in portal-format security scanning systems used in airports, borders, and government facilities.
The ruling directly invalidates only US8300763B2. Because the Federal Circuit issued a Rule 36 affirmance without a written opinion, no claim-level reasoning was published. AS&E may hold continuation or related patents covering overlapping technology that remain active. Competitors should conduct a full patent family analysis of application US12/841401 before concluding the backscatter portal space is fully clear.
American Science and Engineering was represented by Aaron E. Hankel and Kyle E. Friesen of Shook Hardy & Bacon LLP. Viken Detection, Corp. was represented by Christopher S. Schultz of ArentFox Schiff LLP. The three-judge panel comprised Chief Judge Moore, Judge Linn, and Judge Cunningham.
PatSnap Eureka searches patents and litigation data to answer instantly.