US3542018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vent safety switch for heating systems
Assignee: PRIKKEL JOHN III 2952 ENSLEY AVE DAYTON 45414
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Filing: 1968-08-14
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Granted: 1970-11-24
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Expires: 1988-08-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Quick
- 👤 Kenneth F Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:26
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F23; F23D; F23D14/00; F23D14/46; F23D14/60; F23N; F23N5/00; F23N5/02; F23N5/025; F23N5/24; F23N5/245; F24H15/00; F24H15/10; F24H15/112; F24H15/116; F24H15/20; F24H15/235; F24H15/30; F24H15/305; F24H15/31; F24H15/355; F24H15/36; F23N2225/00; F23N2225/08
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) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |