Patent US1661252A successfully refreshed from Google Patents.
US1661252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-control apparatus
Assignee: Individual
•
Filing: 1925-10-21
•
Granted: 1928-03-06
•
Expires: 1945-10-21
Abstract
No abstract record available.
Inventors
- 👤 Fricke Richard
- 👤 Mross Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:43
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/08; F23N1/087; F23N2223/00; F23N2223/22; F23N2225/00; F23N2225/04
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) | 1931-03-06 | 1931-09-05 | 1932-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-03-06 | 1935-09-05 | 1936-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-03-06 | 1939-09-05 | 1940-03-06 | $7700.00 | Window Closed / Lapsed |