US3487931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter unit with removable selfcleaning screen section
Assignee: Universal Oil Products Co
•
Filing: 1968-03-06
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Granted: 1970-01-06
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Expires: 1988-03-06
Abstract
No abstract record available.
Inventors
- 👤 Rueben E Paulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:15
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D25/00; B01D25/30; B01D35/00; B01D35/14; B01D35/147; F; F02; F02M; F02M35/00; F02M35/02; F02M35/08
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) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |