Patent US3835827A successfully refreshed from Google Patents.
Patent US2820430A successfully refreshed from Google Patents.
US2820430A
Expired / Lapsed
US
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Filter and oil change indicator for a lubricating system
Assignee: Individual
•
Filing: 1956-02-27
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Granted: 1958-01-21
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Expires: 1976-02-27
Abstract
No abstract record available.
Inventors
- 👤 Charles A Pulaski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:04
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/10; F01M11/00; F01M11/10; F16; F16N; F16N29/00; F16N29/04; F16N2260/00; F16N2260/02; F16N2260/18; Y; Y10; Y10S; Y10S116/00; Y10S116/42
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |