US2609101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter including automatic reconditioning device
Assignee: Individual
•
Filing: 1949-07-07
•
Granted: 1952-09-02
•
Expires: 1969-07-07
Abstract
No abstract record available.
Inventors
- 👤 Eugene H Howland
- 👤 Raymond G Tessmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:15
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/62; B01D29/66; B01D29/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US14213A
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US1230328A
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US1510568A
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US1370469A
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US1464953A
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US1714232A
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US1943811A
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US2243559A
Cited
US2278148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |