Patent US2617764A successfully refreshed from Google Patents.
Patent US4729105A successfully refreshed from Google Patents.
Patent US1951379A successfully refreshed from Google Patents.
US1951379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined gas and oil burner
Assignee: Individual
•
Filing: 1930-09-26
•
Granted: 1934-03-20
•
Expires: 1950-09-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph T Voorheis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:01
CPC Classifications
F; F23; F23D; F23D17/00
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) | 1937-03-19 | 1937-09-18 | 1938-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-03-19 | 1941-09-18 | 1942-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-03-19 | 1945-09-18 | 1946-03-20 | $7700.00 | Window Closed / Lapsed |