US2688977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relief valve
Assignee: Individual
•
Filing: 1951-09-01
•
Granted: 1954-09-14
•
Expires: 1971-09-01
Abstract
No abstract record available.
Inventors
- 👤 Howard A Droitconr
- 👤 John M Droitcour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:00
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/16; F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; F16K15/18; F16K15/184; F16K15/1845; G05D16/024; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766; Y10T137/7837; Y10T137/7876; Y10T137/7904; Y10T137/7922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |