US2854972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demand valve
Assignee: FIREWEL DEV Co
•
Filing: 1955-10-17
•
Granted: 1958-10-07
•
Expires: 1975-10-17
Abstract
No abstract record available.
Inventors
- 👤 Richard D Cummins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:36
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; A62B9/022; A62B9/025; A61; A61M; A61M16/00; A61M16/08; A61M16/0816; A61M16/0841
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2630129A
Cited
GB663202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |