US2424357A
Expired / Lapsed
US
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Method of and apparatus for modulating the frequency of sound waves
Assignee: Ultrasonic Corp
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Filing: 1945-12-19
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Granted: 1947-07-22
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Expires: 1965-12-19
Abstract
No abstract record available.
Inventors
- 👤 Caperton B Horsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/02; Y; Y10; Y10S; Y10S116/00; Y10S116/18; Y10S99/00; Y10S99/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1591471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-21 | 1951-01-20 | 1951-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-21 | 1955-01-20 | 1955-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-21 | 1959-01-20 | 1959-07-22 | $7700.00 | Window Closed / Lapsed |