US2568420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus
Assignee: Individual
•
Filing: 1947-03-06
•
Granted: 1951-09-18
•
Expires: 1967-03-06
Abstract
No abstract record available.
Inventors
- 👤 Thomson William Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/04; B01D33/044; B01D33/048; B01D33/06; B01D33/80; B01D33/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2101109A
Cited
US2101042A
Cited
US2222469A
Cited
US2377123A
Cited
US2369674A
Cited
US2369653A
Cited
US2445416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |