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US2521060A
Expired / Lapsed
US
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Fil ter
Assignee: Individual
•
Filing: 1946-04-19
•
Granted: 1950-09-05
•
Expires: 1966-04-19
Abstract
No abstract record available.
Inventors
- 👤 William W Hallinan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:53
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/56; B01D46/58; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/333; B01D29/35; B01D29/353; B01D29/50; B01D29/52; B01D29/54; B01D46/10; B01D46/106; B01D46/66; B01D46/79; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2265/00; B01D2265/02; B01D2265/024; B01D2265/025; B01D2265/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |