Patent US1366437A successfully refreshed from Google Patents.
US1366437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-mask
Assignee: Individual
•
Filing: 1918-10-18
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Granted: 1921-01-25
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Expires: 1938-10-18
Abstract
No abstract record available.
Inventors
- 👤 Otto F Wagenhorst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:40
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-01-25 | 1924-07-26 | 1925-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-01-25 | 1928-07-26 | 1929-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-01-25 | 1932-07-26 | 1933-01-25 | $7700.00 | Window Closed / Lapsed |