Patent US3521613A successfully refreshed from Google Patents.
US3521613A
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US
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Engine with die-cast static parts
Assignee: Individual
•
Filing: 1968-09-17
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Granted: 1970-07-28
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Expires: 1988-09-17
Abstract
No abstract record available.
Inventors
- 👤 Aldo Celli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:42
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/002; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/221; F02F7/00; F02F7/0002; F02F7/0012; F02B75/02; F02B2075/022; F02B2075/027; F02B2075/1804; F02B2075/1816; F02B2275/00; F02B2275/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US703511A
Cited
US1720625A
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US1964082A
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US2674988A
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US2781034A
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US3013542A
Cited
US3046953A
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US3173407A
Cited
US3186387A
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US3164143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |