US2421776A
Expired / Lapsed
US
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Assignee: STAYNEW FILTER Corp
•
Filing: 1943-03-24
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Granted: 1947-06-10
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Expires: 1963-03-24
Abstract
No abstract record available.
Inventors
- 👤 Lewis L Dollinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:27
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0012; B01D46/0027; B01D46/003; B01D46/0031; B01D46/0039; B01D46/0041; B01D46/0043; B01D46/24
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) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |