US2697203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance measuring device
Assignee: Boston College
•
Filing: 1950-10-26
•
Granted: 1954-12-14
•
Expires: 1970-10-26
Abstract
No abstract record available.
Inventors
- 👤 Edward S Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US899193A
Cited
US1684403A
Cited
US1917417A
Cited
US2547926A
Cited
US2593175A
Cited
US2626981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |