Patent US2547941A successfully refreshed from Google Patents.
US2547941A
Expired / Lapsed
US
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Metal-edge filter stack washer
Assignee: Individual
•
Filing: 1946-02-01
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Granted: 1951-04-10
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Expires: 1966-02-01
Abstract
No abstract record available.
Inventors
- 👤 Heftler Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:56
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D25/00; B01D25/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T428/00; Y10T428/12; Y10T428/12347
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US990861A
Cited
DE461162C
Cited
US1657346A
Cited
GB334569A
Cited
US2184243A
Cited
US2159196A
Cited
US2260899A
Cited
US2283629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |