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US2817747A
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Method and apparatus for electric resistance welding
Assignee: MCKINNON CHAIN Corp
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Filing: 1955-04-19
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Granted: 1957-12-24
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Expires: 1975-04-19
Abstract
No abstract record available.
Inventors
- 👤 William H Devonshire
- 👤 Thomas A Wilson
- 👤 Humphrey F Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:49
CPC Classifications
B; B21; B21L; B21L3/00; B21L3/02; B23; B23K; B23K11/00; B23K11/24; B23K11/25; B23K2101/00; B23K2101/30
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) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |