Patent US3534258A successfully refreshed from Google Patents.
US3534258A
Expired / Lapsed
US
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Magnetic nondestructive testing system utilizing magnetic tapes with means to indicate flow depth
Assignee: Individual
•
Filing: 1967-05-26
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Granted: 1970-10-13
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Expires: 1987-05-26
Abstract
No abstract record available.
Inventors
- 👤 Friedrich M O Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:17
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3066254A
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US3202914A
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US3209243A
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US3345563A
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US3341771A
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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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |