US2810993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of helical springs having face-ground ends
Assignee: EMIL SCHENKER AG
•
Filing: 1954-01-15
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Granted: 1957-10-29
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Expires: 1974-01-15
Abstract
No abstract record available.
Inventors
- 👤 Stegmann Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:45
CPC Classifications
B; B21; B21F; B21F35/00; B21F11/00; B21F11/005; B24; B24B; B24B7/00; B24B7/10; B24B7/16; B24B7/167; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US481444A
Cited
GB190926067A
Cited
US1498550A
Cited
US1946926A
Cited
US2262619A
Cited
US2163967A
Cited
US2288988A
Cited
US2421704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |