US3498053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound engine
Assignee: Belcan Corp
•
Filing: 1968-09-16
•
Granted: 1970-03-03
•
Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 Robert D Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/04; F02B37/10; F02B37/105; F02B41/00; F02B41/02; F02B41/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1062308A
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US1147280A
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US1616391A
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FR916985A
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US2583651A
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US2578028A
Cited
US2585029A
Cited
US3066663A
Cited
US3232044A
Cited
US3164140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |