Patent US3408473A successfully refreshed from Google Patents.
US3408473A
Expired / Lapsed
US
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Resistance welding circuit
Assignee: 3M Unitek Corp
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Filing: 1967-04-27
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Granted: 1968-10-29
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Expires: 1987-04-27
Abstract
No abstract record available.
Inventors
- 👤 John A Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:45
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/25; B23K11/251
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3258697A
Cited
US2903608A
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US2933625A
Cited
US3205378A
Cited
US3243652A
Cited
US3178551A
Cited
US3233116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |