Patent US3386424A successfully refreshed from Google Patents.
US3386424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines
Assignee: Individual
•
Filing: 1966-12-22
•
Granted: 1968-06-04
•
Expires: 1986-12-22
Abstract
No abstract record available.
Inventors
- 👤 Appeman Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:55
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/04; F02B75/041; F02B75/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US673259A
Cited
US756011A
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US1090647A
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US1792201A
Cited
US1794829A
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US1909729A
Cited
DE688784C
Cited
GB502727A
Cited
US2302851A
Cited
GB661029A
Cited
US3209736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |