US3445768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power monitor,particularly for welders,based on quarter-squares computation procedure
Assignee: DUFFERS ASS
•
Filing: 1964-04-22
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Granted: 1969-05-20
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Expires: 1984-04-22
Abstract
No abstract record available.
Inventors
- 👤 Hugo S Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:40
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/26; G; G01; G01R; G01R15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1938499A
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US1919978A
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US2748380A
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US2900137A
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US3034057A
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US3247501A
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US3127595A
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US3267375A
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US3191017A
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US3194939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |