Industrial Pressure Transmitters Patents: Who Leads and Where Claim Space Is Still Open
51.6% concentration. The five leading assignees together hold 346 of the 670 records in scope — over half the field sits with a small group of incumbents. Filings peaked at 53 in 2018 and have since eased; the most recent complete comparison — 21 in 2021 against 14 in 2024, a 33% decline — points to a maturing rather than an expanding filing curve. 2025 and 2026 figures are still filling in and should not be read as a further drop.
- 1ROSEMOUNT INC32.5%
- 2ENDRESS & HAUSER GMBH & CO KG5.5%
- 3HONEYWELL INTERNATIONAL INC5.1%
- 4KK TOSHIBA4.3%
- 5YOKOGAWA ELECTRIC CORP4.2%
See the full industrial pressure transmitters analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on this landscape
Who holds the most patents on industrial pressure transmitters?
The dataset's leading assignee holds 218 of the 670 records in scope, well ahead of the fifth-ranked assignee at 28 and the tenth-ranked at 11. The top five assignees combined account for 51.6% of all 670 records, so the field is concentrated at the top with a long tail of smaller filers behind it. Any freedom-to-operate review in this space should start with that leading cluster rather than the tail.
Is patent filing for pressure transmitters growing or slowing?
Filings peaked at 53 in 2018 and have since eased; the most recent complete year-over-year comparison shows 21 filings in 2021 falling to 14 in 2024, a 33% decline. Because publication lags filing by roughly 18 months, 2025 and 2026 figures in any trend chart are still incomplete and should not be read as confirming a further drop. The honest read is a maturing filing curve, not a collapsing one.
What does US4342231A actually claim, and does it block new designs?
US4342231A, assigned to Hitachi and dated 1982, claims a differential pressure transmitter built from a separately jointed pressure-receiving portion and sensor portion, with a semiconductor sensor isolated from process contact by seal diaphragms on both sides plus a central diaphragm. It is one of the older, foundational records in this space and sits well outside its original enforcement window, but its diaphragm-isolation architecture is echoed in much later filing. Anyone designing a new diaphragm-seal transmitter should still review it for structural similarity even though it can no longer be asserted.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Industrial Pressure Transmitters covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.