US2650347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance measuring bridge
Assignee: POLYTECHNIC RES AND DEV COMPAN
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Filing: 1950-08-25
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Granted: 1953-08-25
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Expires: 1970-08-25
Abstract
No abstract record available.
Inventors
- 👤 Francis J Gaffney
- 👤 Herbert A Finke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:03
CPC Classifications
G; G01; G01R; G01R17/00
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) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |