Patent US2692585A successfully refreshed from Google Patents.
Patent US3611489A successfully refreshed from Google Patents.
US1331601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator
Assignee: Individual
•
Filing: 1918-05-08
•
Granted: 1920-02-24
•
Expires: 1938-05-08
Abstract
No abstract record available.
Inventors
- 👤 Watanabe Riichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:50
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/02; B; B63; B63C; B63C11/00; B63C11/02; B63C11/12; B63C11/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1923-02-23 | 1923-08-25 | 1924-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-02-23 | 1927-08-25 | 1928-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-02-23 | 1931-08-25 | 1932-02-24 | $7700.00 | Window Closed / Lapsed |