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US3512909A
Expired / Lapsed
US
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Electric ignition system
Assignee: Robertshaw Controls Co
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Filing: 1967-11-15
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Granted: 1970-05-19
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Expires: 1987-11-15
Abstract
No abstract record available.
Inventors
- 👤 Charles H Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:41
CPC Classifications
F; F23; F23Q; F23Q1/00; F23Q1/02; F23Q1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2106249A
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US2221667A
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US2549633A
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US2564851A
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US3079984A
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US3282324A
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US3393038A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |