US691312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating apparatus.
Assignee: Individual
•
Filing: 1901-09-24
•
Granted: 1902-01-14
•
Expires: 1921-09-24
Abstract
No abstract record available.
Inventors
- 👤 John Alston Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/008; F24D19/0082; F02; F02M; F02M15/00; F02M15/02; F02M15/027
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) | 1905-01-13 | 1905-07-15 | 1906-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1909-01-13 | 1909-07-15 | 1910-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1913-01-13 | 1913-07-15 | 1914-01-14 | $7700.00 | Window Closed / Lapsed |