US1228931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating apparatus.
Assignee: TRIANGLE VENTILATION Corp
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Filing: 1915-12-08
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Granted: 1917-06-05
•
Expires: 1935-12-08
Abstract
No abstract record available.
Inventors
- 👤 Jason E Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:33
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/068
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) | 1920-06-04 | 1920-12-04 | 1921-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-06-04 | 1924-12-04 | 1925-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-06-04 | 1928-12-04 | 1929-06-05 | $7700.00 | Window Closed / Lapsed |