Patent US6425924B1 successfully refreshed from Google Patents.
US764709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respiratory apparatus for firemen or others.
Assignee: Individual
•
Filing: 1903-08-13
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Granted: 1904-07-12
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Expires: 1923-08-13
Abstract
No abstract record available.
Inventors
- 👤 Charles Edgar Chapin
- 👤 Arthur Anson Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/02
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) | 1907-07-12 | 1908-01-11 | 1908-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1911-07-12 | 1912-01-11 | 1912-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1915-07-12 | 1916-01-11 | 1916-07-12 | $7700.00 | Window Closed / Lapsed |