Patent US3438561A successfully refreshed from Google Patents.
US3438561A
Expired / Lapsed
US
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Friction welding apparatus with shearing tool for removing flash formed during welding
Assignee: Caterpillar Inc
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Filing: 1967-10-09
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Granted: 1969-04-15
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Expires: 1987-10-09
Abstract
No abstract record available.
Inventors
- 👤 Marion R Calton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:23
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3352995A
Cited
US2124849A
Cited
US2120316A
Cited
US3036202A
Cited
US3268247A
Cited
US3259969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |