Patent US2433845A successfully refreshed from Google Patents.
US2433845A
Expired / Lapsed
US
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Sound operated relay system
Assignee: Individual
•
Filing: 1941-11-28
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Granted: 1948-01-06
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Expires: 1961-11-28
Abstract
No abstract record available.
Inventors
- 👤 Harvey C Hayes
- 👤 Horace M Trent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:54
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1873095A
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US2233616A
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US1405708A
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US1867225A
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US2070900A
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US2015962A
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US2075774A
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US2085198A
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US2111246A
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US2221569A
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US2255473A
Cited
US2282182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-05 | 1951-07-07 | 1952-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-05 | 1955-07-07 | 1956-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-05 | 1959-07-07 | 1960-01-06 | $7700.00 | Window Closed / Lapsed |