Patent US3367020A successfully refreshed from Google Patents.
US3367020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing tubes of certain metals for subsequent joining by welding
Assignee: Individual
•
Filing: 1965-05-19
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Granted: 1968-02-06
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Expires: 1985-05-19
Abstract
No abstract record available.
Inventors
- 👤 Robert D Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:00
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K20/2333; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1834581A
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US1935063A
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US2336488A
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US2751808A
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US2850798A
Cited
US2998646A
Cited
US3040427A
Cited
US3191276A
Cited
US3203715A
Cited
US3217398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |