Patent US2921177A successfully refreshed from Google Patents.
US2921177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage percussion welding apparatus
Assignee: AT&T Inc
•
Filing: 1957-06-27
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Granted: 1960-01-12
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Expires: 1977-06-27
Abstract
No abstract record available.
Inventors
- 👤 John S Gellatly
- 👤 Joel R Johnson
- 👤 Amos L Quinlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:09
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2442609A
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US2302420A
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US2384014A
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US2430260A
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US2455526A
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US2467379A
Cited
US2441822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |