US3499424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary internal combustion engines
Assignee: Individual
•
Filing: 1968-02-29
•
Granted: 1970-03-10
•
Expires: 1988-02-29
Abstract
No abstract record available.
Inventors
- 👤 Joe G Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
F; F02; F02B; F02B57/00; F02B57/08; F16; F16H; F16H21/00; F16H21/10; F16H21/16; F16H21/18; F16H21/22; F16H21/30; F01; F01B; F01B9/00; F01B9/04; F01B9/042; F01B2009/045; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1816
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1138388A
Cited
US1157811A
Cited
US1272791A
Cited
US1394587A
Cited
US2990820A
Cited
US3200797A
Cited
US3292603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |