US3417977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air control system for heating unit
Assignee: Mammoth Industries Inc
•
Filing: 1967-02-09
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Granted: 1968-12-24
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Expires: 1987-02-09
Abstract
No abstract record available.
Inventors
- 👤 Charles E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:24
CPC Classifications
F; F23; F23N; F23N3/00; F23N3/08; F23N3/085; F23N1/00; F23N1/02; F23N1/025; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0488; F23N2235/00; F23N2235/02; F23N2235/06; F23N2235/10; Y; Y02; Y02B; Y02B30/00
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |