Patent US2281439A successfully refreshed from Google Patents.
US2281439A
Expired / Lapsed
US
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Die set for making metal-edge filters
Assignee: Individual
•
Filing: 1941-03-06
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Granted: 1942-04-28
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Expires: 1961-03-06
Abstract
No abstract record available.
Inventors
- 👤 Heftler Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:23
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/06; Y; Y10; Y10S; Y10S83/00; Y10S83/929; Y10S83/953; Y10T; Y10T83/00; Y10T83/04; Y10T83/0448; Y10T83/0467; Y10T83/202; Y10T83/2033; Y10T83/2037; Y10T83/2046; Y10T83/2048; Y10T83/2057; Y10T83/2059; Y10T83/2063; Y10T83/444; Y10T83/447; Y10T83/869; Y10T83/8821; Y10T83/8828; Y10T83/8831; Y10T83/8835
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-04-27 | 1945-10-27 | 1946-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-27 | 1949-10-27 | 1950-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-27 | 1953-10-27 | 1954-04-28 | $7700.00 | Window Closed / Lapsed |