US2550853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure filter recharge
Assignee: Individual
•
Filing: 1945-09-27
•
Granted: 1951-05-01
•
Expires: 1965-09-27
Abstract
No abstract record available.
Inventors
- 👤 Corliss D Nugent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
B; B01; B01D; B01D27/00; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/23; B01D29/50; B01D29/52; B01D29/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1753809A
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US1940316A
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US2086739A
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US2153062A
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US2168125A
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US2197471A
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US2196821A
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US2209180A
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US2362530A
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US2365766A
Cited
US2232423A
Cited
US2345848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |