Patent US2537992A successfully refreshed from Google Patents.
US2537992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas mask canister
Assignee: Individual
•
Filing: 1939-03-18
•
Granted: 1951-01-16
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Expires: 1959-03-18
Abstract
No abstract record available.
Inventors
- 👤 William E Gross
- 👤 Paul O Rockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:53
CPC Classifications
A; A62; A62B; A62B23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1896395A
Cited
US2002936A
Cited
US2174528A
Cited
US2122111A
Cited
GB426298A
Cited
US2063990A
Cited
FR833601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |