US3448691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy controller
Assignee: Individual
•
Filing: 1967-07-03
•
Granted: 1969-06-10
•
Expires: 1987-07-03
Abstract
No abstract record available.
Inventors
- 👤 David M Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:29
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/46; F04F5/461; E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1187719A
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US2198542A
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US2129515A
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US2140306A
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US2630069A
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US2737019A
Cited
US3007416A
Cited
US3043107A
Cited
US3139041A
Cited
US3128709A
Cited
US3340819A
Cited
US3389938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |