US2839734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency slope detection sonar
Assignee: Individual
•
Filing: 1950-05-01
•
Granted: 1958-06-17
•
Expires: 1970-05-01
Abstract
No abstract record available.
Inventors
- 👤 William T Hanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:02
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/343; G01S1/00; G01S1/72; Y; Y10; Y10S; Y10S367/00; Y10S367/901; Y10S367/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2166991A
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US2214929A
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US2433361A
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US2426187A
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US2405134A
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US2422135A
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US2638586A
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US2450352A
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US2431854A
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US2475609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |