Patent US3521022A successfully refreshed from Google Patents.
US3521022A
Expired / Lapsed
US
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Underwater arc welding process
Assignee: Kakumaru Industry Co Ltd
•
Filing: 1968-01-18
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Granted: 1970-07-21
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Expires: 1988-01-18
Abstract
No abstract record available.
Inventors
- 👤 Sadao Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:01
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/0061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2667751A
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US2686860A
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US2963570A
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US2932723A
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US3053967A
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US3328970A
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US3352993A
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US3263056A
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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) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |