US3399271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audience measuring system employing constant current loads
Assignee: R&R Research Ltd
•
Filing: 1964-02-18
•
Granted: 1968-08-27
•
Expires: 1984-02-18
Abstract
No abstract record available.
Inventors
- 👤 Butcher Raymond Alec
- 👤 White Roy Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:04
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/162; H04N7/163; H04H; H04H60/00; H04H60/35; H04H60/38; H04H60/41; H04H60/44; H04H60/09; H04H60/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3249689A
Cited
US3281695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |