US3497667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tandem arc automatic welding
Assignee: Union Tank Car Co
•
Filing: 1966-11-28
•
Granted: 1970-02-24
•
Expires: 1986-11-28
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Howlett
- 👤 Clarence Verbeek
- 👤 Laurence N Shupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:56
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/12; B23K9/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2763770A
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US2837627A
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US2916605A
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US2900487A
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US3035159A
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US3171944A
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US3197604A
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US3300618A
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US3303321A
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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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |