AS&E v. Viken Detection: Federal Circuit Vacates Backscatter Portal Patent Ruling
American Science and Engineering, Inc. (AS&E) appealed a patentability determination concerning US7400701B1, its patent covering backscatter X-ray inspection portal technology, against Viken Detection. After 762 days, the Federal Circuit vacated the lower decision and remanded — leaving the patent’s validity unresolved.
Federal Circuit nullifies backscatter portal patentability finding
American Science and Engineering, Inc., a leader in X-ray security screening technology and assignee of US7400701B1, appealed a patentability determination against Viken Detection, Corp. before the Court of Appeals for the Federal Circuit (Case No. 23-2127). The patent at issue covers backscatter inspection portal technology — a category of X-ray scanning systems used in security and contraband detection applications. The appeal was filed on 7 July 2023.
The Federal Circuit issued its disposition on 7 August 2025, ordering the lower decision vacated and remanded. A vacatur at the appellate level means the prior ruling carries no legal force — the finding on patentability has been nullified and the matter returned to the originating tribunal for reconsideration consistent with the Federal Circuit’s guidance. Neither party can claim a final merits victory from this disposition.
At 762 days, the appeal duration is consistent with technically complex patentability disputes at the Federal Circuit. The vacatur suggests the appellate panel identified a legal or procedural error sufficient to require reconsideration, though the public record does not detail the specific grounds. The ultimate validity of US7400701B1 remains unresolved pending the remand proceeding, preserving uncertainty for both parties and competitors operating in the backscatter inspection space.
Filing to Vacated and Remanded in 762 days
762 days from filing to Federal Circuit disposition — consistent with complex appeal timelines
Federal Circuit vacates: what the remand means for both parties
Vacatur nullifies the prior ruling — the slate is reset
A Federal Circuit vacatur means the lower tribunal’s patentability determination is struck from legal effect. It is not an affirmance or a reversal on the merits — rather, the appellate panel found the decision below could not stand as rendered, typically due to legal error, an insufficient record, or a standard-of-review failure. The case is remanded for the originating body to reconsider under corrected guidance.
Decision nullified — remand orderedAS&E avoids an adverse patentability finding — for now
For AS&E, the vacatur prevents an unfavourable patentability ruling from becoming final and binding. US7400701B1 is not confirmed invalid by this decision — the matter is returned for reconsideration. However, the patent also cannot be treated as conclusively valid. AS&E must continue to defend the patent’s patentability in the remand proceeding before it can rely on a definitive outcome.
Validity unresolved — remand continuesViken loses its patentability finding — case sent back
Viken Detection had obtained a favourable patentability determination below. The Federal Circuit’s vacatur eliminates that win: Viken cannot rely on the nullified ruling to assert that US7400701B1 is unpatentable. Viken must re-argue its invalidity position in the remand proceeding. This reset raises the cost and uncertainty of the challenge without foreclosing Viken’s ability to prevail on remand.
Prior win nullified — must re-litigateBackscatter portal IP landscape remains unsettled post-vacatur
Companies developing or procuring backscatter X-ray inspection portals face continued uncertainty over the enforceability of US7400701B1. The vacatur keeps the patent in legal limbo — neither confirmed valid nor invalidated — which may complicate freedom-to-operate assessments and licensing negotiations in the security screening sector. Competitors and procurement stakeholders should monitor the remand outcome closely.
IP uncertainty persists in security screeningFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | American Science and Engineering, Inc. | Company | X-ray security screening technology company — holder of US7400701B1Search in Eureka ↗ |
| Defendant | Viken Detection, Corp. | Company | Viken Detection, Corp. — security detection technology company and appelleeSearch 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 — ‘VACATED AND REMANDED’ — is a dispositive appellate instruction that strips the lower patentability ruling of all legal effect. At the appellate level, vacatur is distinct from reversal: it does not substitute the Federal Circuit’s own merits judgment but instead signals that the decision below was legally deficient and must be reconsidered. The standard of review at the Federal Circuit for patentability questions typically involves de novo review of legal conclusions and deference to factual findings. Neither party emerges with a binding merits determination from this outcome.
US7400701B1 — Backscatter X-ray inspection portal technology
US7400701B1, filed under application number US11/097092, protects technology relating to backscatter X-ray inspection portals — scanning systems that detect concealed threats or contraband by analysing X-ray photons scattered back from a subject. Backscatter technology is widely deployed in border control, customs, and high-security facility access screening. The patent’s assignee, American Science and Engineering, Inc., is a longstanding specialist in X-ray-based security detection, and this patent represents core intellectual property in its portal inspection product line.
The strategic significance of US7400701B1 lies in its coverage of inspection portal architecture — a product category subject to government procurement, export controls, and competitive pressure from emerging security detection entrants such as Viken Detection. A patent covering foundational portal design elements could influence licensing dynamics across the sector. With validity now unresolved following the Federal Circuit vacatur, competitors and procurement bodies face continued uncertainty, and the patent remains a material asset in AS&E’s IP portfolio pending the remand outcome.
Should you run an FTO against US7400701B1?
Any company designing, manufacturing, or procuring backscatter X-ray inspection portals should treat US7400701B1 as an active enforcement risk. The Federal Circuit vacatur does not invalidate the patent — it reinstates uncertainty. Product teams developing personnel or cargo screening portals that use backscatter X-ray principles, or that may overlap with the portal architecture claimed in this patent, should prioritise a freedom-to-operate assessment before the remand produces a final validity determination.
PatSnap Eureka’s FTO Search Agent can map the claim scope of US7400701B1 against your product architecture, identify prior art relevant to the remand proceeding, and surface related AS&E and Viken Detection patents that may create overlapping risk. Run a targeted FTO now to establish your clearance position before the remand timeline resolves — avoiding a reactive scramble if the patent is upheld.
Run a freedom-to-operate analysis on US7400701B1 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit appeals involving backscatter and X-ray security patents
Explore comparable Federal Circuit patentability appeals in the X-ray and security screening sector — cases with parallel vacatur, invalidity, or claim construction dynamics.
What this case signals for the security screening IP landscape
The Federal Circuit’s vacatur in AS&E v. Viken keeps a core backscatter portal patent unresolved — with material consequences for IP strategy across the security detection sector.
Vacatur extends commercial uncertainty: don’t assume invalidity
A vacatur is not a finding of invalidity. Companies treating US7400701B1 as dead risk exposure if the patent is confirmed valid on remand. Product teams and licensing counsel operating in the backscatter inspection space should maintain their FTO analysis under a patent-live scenario until the remand produces a definitive outcome.
Federal Circuit remands signal reviewable error — watch the remand closely
When the Federal Circuit vacates rather than affirms or reverses, it typically signals a substantive legal issue with how the lower tribunal applied the relevant standard. The remand decision will likely clarify the patentability analysis framework applicable to backscatter portal claims, creating precedent relevant to adjacent security imaging patents.
American v Viken — key questions answered
The vacatur nullifies the lower patentability ruling without substituting a new merits decision. US7400701B1 is neither confirmed valid nor adjudicated invalid. The case is remanded for the originating tribunal to reconsider. AS&E retains the patent but cannot rely on a confirmed validity finding; Viken loses its prior favourable ruling and must re-argue invalidity.
US7400701B1 is a US patent assigned to American Science and Engineering, Inc. (AS&E) covering backscatter X-ray inspection portal technology. Backscatter portals use scattered X-ray photons to detect concealed objects and are commonly deployed in border security, customs screening, and high-security access control. The patent was filed under application number US11/097092.
A reversal substitutes the appellate court’s own judgment for that of the lower tribunal — for example, finding a patent valid where the lower body found it invalid. A vacatur nullifies the lower decision without replacing it, typically because the appellate court identified a legal or procedural error. The matter is remanded for the lower tribunal to decide again under corrected guidance. Neither outcome is a final merits win for either party.
The appellant is American Science and Engineering, Inc. (AS&E), represented by Aaron E. Hankel and Kyle E. Friesen of Shook Hardy Bacon LLP. The appellee is Viken Detection, Corp., represented by Christopher S. Schultz of ArentFox Schiff LLP. The appeal was decided by the Court of Appeals for the Federal Circuit.
Yes. The vacatur leaves the patent’s validity unresolved, meaning US7400701B1 remains a potential enforcement risk. Companies designing or procuring backscatter X-ray inspection portals should conduct an FTO analysis under a patent-live assumption. If the remand tribunal upholds the patent, those who relied on the vacatur as a de facto invalidity finding may face unexpected exposure.
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