Patent US3404250A successfully refreshed from Google Patents.
US3404250A
Expired / Lapsed
US
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Welding apparatus
Assignee: 3M Unitek Corp
•
Filing: 1966-07-01
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Granted: 1968-10-01
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Expires: 1986-07-01
Abstract
No abstract record available.
Inventors
- 👤 Derek J Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:23
CPC Classifications
H; H05; H05K; H05K13/00; H05K13/04; H05K13/046; H05K13/0465; B; B23; B23K; B23K11/00; B23K11/24; B23K11/241; B23K11/243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2312938A
Cited
US2313941A
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US2356643A
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US2472368A
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US2787700A
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US3109921A
Cited
US3029348A
Cited
US3207904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |