Patent US3487634A successfully refreshed from Google Patents.
US3487634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant horsepower internal combustion engines
Assignee: Mack Trucks Inc
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Filing: 1968-03-19
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Granted: 1970-01-06
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Expires: 1988-03-19
Abstract
No abstract record available.
Inventors
- 👤 Walter M May
- 👤 Winton J Pelizzoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:54
CPC Classifications
F; F02; F02D; F02D23/00; F02D23/02; F02B; F02B23/00; F02B23/02; F02B37/00; F02M; F02M59/00; F02M59/44; F02M59/447; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |