Patent US3542275A successfully refreshed from Google Patents.
US3542275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating friction welder
Assignee: Caterpillar Inc
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Filing: 1968-04-12
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Granted: 1970-11-24
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Expires: 1988-04-12
Abstract
No abstract record available.
Inventors
- 👤 Calvin D Loyd
- 👤 Ramamurat R Maurya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:10
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/12; B23K20/1205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |