Patent US3548303A successfully refreshed from Google Patents.
US3548303A
Expired / Lapsed
US
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Resistance measuring bridge having an amplification system providing a signal for terminating a machining process
Assignee: Sprague Electric Co
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Filing: 1967-04-06
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Granted: 1970-12-15
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Expires: 1987-04-06
Abstract
No abstract record available.
Inventors
- 👤 Walter Helgeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:54
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/10; G01R17/105; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3179248A
Cited
US2978364A
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US3003113A
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US3063346A
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US3267378A
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US3375342A
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US3338680A
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US3290479A
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US3388461A
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US3354311A
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US3379973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |