Patent US2815790A successfully refreshed from Google Patents.
US2815790A
Expired / Lapsed
US
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Apparatus for making helical conveyor blades by edgewise bending and squeezing rolls
Assignee: Individual
•
Filing: 1955-06-03
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Granted: 1957-12-10
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Expires: 1975-06-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Mayrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:11
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/49316
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US347829A
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US1570117A
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US1738994A
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US1896350A
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US1939080A
Cited
US1775555A
Cited
US1981566A
Cited
US2262227A
Cited
US2374144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |