US3437884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame monitoring circuit
Assignee: Protection Controls Inc
•
Filing: 1966-11-21
•
Granted: 1969-04-08
•
Expires: 1986-11-21
Abstract
No abstract record available.
Inventors
- 👤 Richard F Mandock
- 👤 Ronald F Plambeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:47
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/12; F23N5/123; F23N2229/00; F23N2229/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2832929A
Cited
US2817758A
Cited
US3091724A
Cited
US3238423A
Cited
US3267300A
Cited
US3348104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |