Patent US3393667A successfully refreshed from Google Patents.
US3393667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary combustion engine with dual ignition devices
Assignee: John Deere Technologies International Inc
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Filing: 1967-01-19
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Granted: 1968-07-23
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Expires: 1987-01-19
Abstract
No abstract record available.
Inventors
- 👤 Jones Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:26
CPC Classifications
F; F02; F02B; F02B53/00; F02B53/12; F02B1/00; F02B1/02; F02B1/04; F02B2053/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3245388A
Cited
US3246636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |