Patent US3536879A successfully refreshed from Google Patents.
US3536879A
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US
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Welding system
Assignee: Phelps Dodge Copper Products Corp
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Filing: 1967-09-12
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Granted: 1970-10-27
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Expires: 1987-09-12
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Hartsell Jr
- 👤 Benoit J Sirois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/028; B23K9/0282; B23K9/0286; B23D; B23D79/00; B23D79/02; B23D79/021; B23K37/00; B23K37/08; B24; B24B; B24B17/00; B24B17/02; B24B5/00; B24B5/02; B24B5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |