US3490039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring high resistances in relation to resistance ratio,capacitance,and a time interval
Assignee: Canadian Patents and Development Ltd
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Filing: 1968-01-29
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Granted: 1970-01-13
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Expires: 1988-01-29
Abstract
No abstract record available.
Inventors
- 👤 Sai Hoi Tsao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:27
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |