Patent US3665421A successfully refreshed from Google Patents.
US2421629A
Expired / Lapsed
US
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Method for closing the ends of metal tubes
Assignee: Individual
•
Filing: 1943-02-10
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Granted: 1947-06-03
•
Expires: 1963-02-10
Abstract
No abstract record available.
Inventors
- 👤 Otto A Langos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:59
CPC Classifications
B; B65; B65B; B65B7/00; B65B7/14; B21; B21D; B21D41/00; B21D41/04; B21D41/045; B21K; B21K21/00; B21K21/16
Claims Analysis
Total Claims: 0
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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) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |