US3476020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine block with case hardening of cylinder walls
Assignee: Caterpillar Inc
•
Filing: 1968-09-03
•
Granted: 1969-11-04
•
Expires: 1988-09-03
Abstract
No abstract record available.
Inventors
- 👤 Charles N Fangman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/02; F02F1/10; F02F1/14; F02F7/00; F02F7/006; F02F2007/0063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733086A
Cited
FR649723A
Cited
US2108392A
Cited
US2110064A
Cited
GB524036A
Cited
US2448983A
Cited
US2745777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |