US2547074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audience reaction recorder
Assignee: Individual
•
Filing: 1947-10-31
•
Granted: 1951-04-03
•
Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 Bernard D Cirlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:25
CPC Classifications
H; H04; H04H; H04H60/00; H04H60/29; H04H60/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US544218A
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US1219053A
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US1267504A
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US1620224A
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US2206702A
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US2408458A
Cited
US2451464A
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US2483573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |