Patent US2489004A successfully refreshed from Google Patents.
Patent US2120146A successfully refreshed from Google Patents.
US2120146A
Expired / Lapsed
US
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Spring winding machine
Assignee: Madison Management Group Inc
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Filing: 1937-10-29
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Granted: 1938-06-07
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Expires: 1957-10-29
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Halvorsen
- 👤 Arthur C Nigro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:45
CPC Classifications
B; B21; B21F; B21F3/00; B21F3/02; B21F3/04; B21F23/00
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) | 1941-06-06 | 1941-12-06 | 1942-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-06-06 | 1945-12-06 | 1946-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-06-06 | 1949-12-06 | 1950-06-07 | $7700.00 | Window Closed / Lapsed |