Patent US2840897A successfully refreshed from Google Patents.
US2840897A
Expired / Lapsed
US
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Method of making flexible metal tubing
Assignee: Airtron Inc
•
Filing: 1954-01-07
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Granted: 1958-07-01
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Expires: 1974-01-07
Abstract
No abstract record available.
Inventors
- 👤 Ingalls David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:54
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0803; H; H01; H01P; H01P3/00; H01P3/12; H01P3/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016; Y10T29/49826; Y10T29/49893
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2563578A
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US976060A
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US943306A
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US2374498A
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US2402497A
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US2540141A
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US2606953A
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US2556187A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |