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Patent US3531620A successfully refreshed from Google Patents.
US3531620A
Expired / Lapsed
US
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Arc welding electrode for steel without using gas or the like
Assignee: Kobe Steel Ltd
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Filing: 1967-06-30
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Granted: 1970-09-29
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Expires: 1987-06-30
Abstract
No abstract record available.
Inventors
- 👤 Masayasu Arikawa
- 👤 Izumi Ichihara
- 👤 Shou Horiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:14
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/36; B23K35/368; B23K35/3601; B23K35/3602; B23K35/3603; B23K35/3605
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |