US3535619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell-type transformer instrument for determining the amount of magnetic material in a substance wherein a sample of the substance functions as the center leg of the transformer
Assignee: Kennecott Corp
•
Filing: 1968-02-28
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Granted: 1970-10-20
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Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Henry W Franz
- 👤 Michael L Gonshor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:19
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA637857A
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US2334393A
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US2451596A
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US2799823A
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US2680833A
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US2779916A
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US2904745A
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US3058054A
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US3324386A
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US3395339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |