US2754971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicell filter apparatus
Assignee: General Filter Co
•
Filing: 1952-06-27
•
Granted: 1956-07-17
•
Expires: 1972-06-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Lawlor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:55
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4631; B01D24/4636; B01D24/002; B01D24/004; B01D24/02; B01D24/10; B01D24/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US477727A
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US514531A
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US647780A
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US768014A
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GB191421120A
Cited
US1279240A
Cited
GB431686A
Cited
US2129181A
Cited
US2084659A
Cited
US2459353A
Cited
US2594568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |