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US2729339A
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Automatic discriminatory clogging detector for oil filters
Assignee: Purolator Products Inc
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Filing: 1953-08-28
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Granted: 1956-01-03
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Expires: 1973-08-28
Abstract
No abstract record available.
Inventors
- 👤 Marion M Mccoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; B01D35/147; Y; Y10; Y10S; Y10S116/00; Y10S116/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1780663A
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US1676268A
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GB450104A
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FR801048A
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FR806635A
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US2499494A
Cited
US2533266A
Cited
US2615573A
Cited
US2639783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |