Patent US1691941A successfully refreshed from Google Patents.
US1691941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil furnace
Assignee: Individual
•
Filing: 1927-07-23
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Granted: 1928-11-20
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Expires: 1947-07-23
Abstract
No abstract record available.
Inventors
- 👤 Vladimir B Sounitza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
F; F23; F23C; F23C99/00; F23C2700/00; F23C2700/02; F23C2700/026
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) | 1931-11-20 | 1932-05-21 | 1932-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-11-20 | 1936-05-21 | 1936-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-11-20 | 1940-05-21 | 1940-11-20 | $7700.00 | Window Closed / Lapsed |