US2276424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic hydraulic safety lock for oil burners
Assignee: Individual
•
Filing: 1940-08-23
•
Granted: 1942-03-17
•
Expires: 1960-08-23
Abstract
No abstract record available.
Inventors
- 👤 Ludvig K Siversen
- 👤 John D Stigen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:27
CPC Classifications
F; F23; F23D; F23D5/00; F23D5/12; F23D5/16; F23N; F23N2239/00; F23N2239/06; Y; Y10; Y10S; Y10S220/00; Y10S220/17; Y10T; Y10T137/00; Y10T137/9029
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) | 1945-03-16 | 1945-09-15 | 1946-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-16 | 1949-09-15 | 1950-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-16 | 1953-09-15 | 1954-03-17 | $7700.00 | Window Closed / Lapsed |