Patent US3422518A successfully refreshed from Google Patents.
US3422518A
Expired / Lapsed
US
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Method of reforming tubular metal blanks into inner-fin tubes
Assignee: Valley Metallurgical Processing Co
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Filing: 1967-10-20
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Granted: 1969-01-21
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Expires: 1987-10-20
Abstract
No abstract record available.
Inventors
- 👤 Fred W French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:56
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/205; B21C37/207; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3118328A
Cited
US654590A
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US2944448A
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FR1073209A
Cited
US3017793A
Cited
US3289451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |