Patent US2502876A successfully refreshed from Google Patents.
US2502876A
Expired / Lapsed
US
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Electric resistance spot welding apparatus
Assignee: Ampco Metal Inc
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Filing: 1949-01-19
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Granted: 1950-04-04
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Expires: 1969-01-19
Abstract
No abstract record available.
Inventors
- 👤 Henry A Mullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:03
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/3009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1281454A
Cited
FR716098A
Cited
FR40610E
Cited
US2001688A
Cited
US2051284A
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US2281335A
Cited
US2355145A
Cited
US2329904A
Cited
US2416374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |