Patent US3515844A successfully refreshed from Google Patents.
US3515844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable welding apparatus
Assignee: Pittsburgh Des Moines Steel Co
•
Filing: 1969-01-22
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Granted: 1970-06-02
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Expires: 1989-01-22
Abstract
No abstract record available.
Inventors
- 👤 Lawrence A Colarossi
- 👤 Gebhart J Reiling Jr
- 👤 Anthony V Tarquinio
- 👤 Thomas S James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:06
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933340A
Cited
US1956406A
Cited
US2395723A
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US2900486A
Cited
US2944141A
Cited
US3076889A
Cited
US3128368A
Cited
US3171012A
Cited
US3249733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |