Patent US2443875A successfully refreshed from Google Patents.
US2443875A
Expired / Lapsed
US
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Lubricating system for engines
Assignee: Avco Manufacturing Corp
•
Filing: 1943-03-13
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Granted: 1948-06-22
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Expires: 1963-03-13
Abstract
No abstract record available.
Inventors
- 👤 Carl C Spangenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:33
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/10; F01M1/12; F01M13/00; F01M13/04; F16; F16N; F16N39/00; F16N39/002; F01M2001/105; F01M2001/1071; F01M2001/126; F01M11/00; F01M2011/0095; F01M2013/0038; F01M2013/005; F01M2013/0061; F01M2013/0072; F01M2013/0422; F01M2013/0438
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-22 | 1951-12-22 | 1952-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-22 | 1955-12-22 | 1956-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-22 | 1959-12-22 | 1960-06-22 | $7700.00 | Window Closed / Lapsed |