Patent US2679681A successfully refreshed from Google Patents.
US2679681A
Expired / Lapsed
US
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Method of making expanded tube ends
Assignee: Bundy Tubing Co
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Filing: 1949-06-23
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Granted: 1954-06-01
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Expires: 1969-06-23
Abstract
No abstract record available.
Inventors
- 👤 John I Resler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:26
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/02; B21D41/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US40967A
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US42159A
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US427240A
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US853900A
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US1106798A
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US1656222A
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US1538610A
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US2306160A
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US2241091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |