US2690768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive device
Assignee: American Steel Foundries
•
Filing: 1950-12-21
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Granted: 1954-10-05
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Expires: 1970-12-21
Abstract
No abstract record available.
Inventors
- 👤 Robert K Sedgwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189805025A
Cited
US1525156A
Cited
US2411251A
Cited
US2404843A
Cited
US2520660A
Cited
US2562385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |