Patent US3476249A successfully refreshed from Google Patents.
US3476249A
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US
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Dual,pleated element,filter cartridge
Assignee: W G B OIL CLARIFIER Inc
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Filing: 1967-10-06
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Granted: 1969-11-04
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Expires: 1987-10-06
Abstract
No abstract record available.
Inventors
- 👤 Donald M Gray
- 👤 Hollis M Burhans
- 👤 Wendell H Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:42
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/23; B01D29/232; B01D29/50; B01D29/56; B01D29/58; B01D35/00; B01D35/14; B01D35/147; B01D35/153
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) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |