US2768236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing test system
Assignee: Patent Management Inc
•
Filing: 1950-12-06
•
Granted: 1956-10-23
•
Expires: 1970-12-06
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Allison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:29
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2298618A
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US2322884A
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US2394569A
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US2292745A
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US2413936A
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US2537911A
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US2471136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |