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US2558754A
Expired / Lapsed
US
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Automatic radio listener survey system
Assignee: Individual
•
Filing: 1947-03-18
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Granted: 1951-07-03
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Expires: 1967-03-18
Abstract
No abstract record available.
Inventors
- 👤 William D Horn
- 👤 John R Ragazzini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:11
CPC Classifications
H; H04; H04H; H04H60/00; H04H60/56; H04H60/58; H04H60/35; H04H60/38; H04H60/41; H04H60/44
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) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |