Patent US2631645A successfully refreshed from Google Patents.
US2631645A
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Apparatus and method for forming corrugations in tubing
Assignee: Individual
•
Filing: 1948-09-20
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Granted: 1953-03-17
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Expires: 1968-09-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; B21D15/06; B31; B31F; B31F1/00; B31F1/20; B31F1/205; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US589694A
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US700662A
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US1210895A
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US1860989A
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US2002896A
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US1843395A
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US1954881A
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US2093155A
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US2390533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |