US2768371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound simulator for use in aircraft pilot trainers
Assignee: Westinghouse Air Brake Co
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Filing: 1955-06-09
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Granted: 1956-10-23
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Expires: 1975-06-09
Abstract
No abstract record available.
Inventors
- 👤 William L Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:56
CPC Classifications
H; H03; H03B; H03B29/00; G; G01; G01S; G01S1/00; G01S1/72; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/22; G10; G10H; G10H5/00
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) | 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 |