US3469565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankcase ventilating means for internal combustion engines
Assignee: Caterpillar Inc
•
Filing: 1967-08-17
•
Granted: 1969-09-30
•
Expires: 1987-08-17
Abstract
No abstract record available.
Inventors
- 👤 Robert L Weber
- 👤 Thomas M Albright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:49
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/02; F02B55/04; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/023; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2125435A
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GB526151A
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US2775960A
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US3056420A
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US3144011A
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US3241537A
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US3108581A
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US3159150A
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US3170448A
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US3262436A
Cited
US3312207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |