US2443892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety control and ignition apparatus for gaseous fuel burners
Assignee: Robertshaw Controls Co
•
Filing: 1945-09-21
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Granted: 1948-06-22
•
Expires: 1965-09-21
Abstract
No abstract record available.
Inventors
- 👤 Michael J Caparone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:31
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10; F23N5/105; F23N2227/00; F23N2227/22; F23N2227/26; F23N2229/00; F23N2229/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-22 | 1951-12-22 | 1952-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-22 | 1955-12-22 | 1956-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-22 | 1959-12-22 | 1960-06-22 | $7700.00 | Window Closed / Lapsed |