US3417325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inside pipe diameter caliper using coaxial excitation and pickup coils
Assignee: IRA J MCCULLOUGH
•
Filing: 1968-02-15
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Granted: 1968-12-17
•
Expires: 1988-02-15
Abstract
No abstract record available.
Inventors
- 👤 Ira J Mccullough
- 👤 Stanley G Stroud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:24
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/12; G01B7/13; E; E21; E21B; E21B47/00; E21B47/08; E21B47/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2527170A
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US2540588A
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US2698920A
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US2992390A
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US3060377A
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US3114876A
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US3075144A
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US3166710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |