Patent US2920637A successfully refreshed from Google Patents.
US2920637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve structure for a demand oxygen regulator
Assignee: Aro Equipment Corp
•
Filing: 1954-11-08
•
Granted: 1960-01-12
•
Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Adams Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:33
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; A62B9/022; A61; A61M; A61M16/00; A61M16/20; A61M16/201; A61M16/206
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US110082A
Cited
US666026A
Cited
US788240A
Cited
US1125342A
Cited
US1297312A
Cited
US1624736A
Cited
US2318827A
Cited
US2627866A
Cited
FR969664A
Cited
US2685288A
Cited
US2597961A
Cited
US2787280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |