US2902861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensing device
Assignee: SWARTWOUT CO
•
Filing: 1955-03-09
•
Granted: 1959-09-08
•
Expires: 1975-03-09
Abstract
No abstract record available.
Inventors
- 👤 Richard H Frost
- 👤 Earl O Schweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:08
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0042; G01L9/0044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US278910A
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US278909A
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US1393446A
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US1479733A
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DE606954C
Cited
DE688097C
Cited
FR916664A
Cited
US2472045A
Cited
DE900895C
Cited
US2715336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |