Patent US3257591A successfully refreshed from Google Patents.
US3257591A
Expired / Lapsed
US
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Plug type probe for capacitively measuring surface flatness surrounding circular hole in metal plate
Assignee: General Electric Co
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Filing: 1962-09-12
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Granted: 1966-06-21
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Expires: 1982-09-12
Abstract
No abstract record available.
Inventors
- 👤 Samuel G Hardy
- 👤 James R Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:52
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/34; G01B7/345
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |