US2111720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering method and apparatus
Assignee: Sunoco Inc
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Filing: 1936-03-13
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Granted: 1938-03-22
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Expires: 1956-03-13
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Padgett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:08
CPC Classifications
B; B30; B30B; B30B9/00; B30B9/02; B30B9/24; B01; B01D; B01D33/00; B01D33/04; B01D33/042; B01D33/58; B01D33/60; B01D33/62; B01D33/64; B01D33/642; B01D33/646
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-03-21 | 1941-09-20 | 1942-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-03-21 | 1945-09-20 | 1946-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-03-21 | 1949-09-20 | 1950-03-22 | $7700.00 | Window Closed / Lapsed |