US3534172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio transmission system and transmitter and receiver for transmission of stereophonic signal to be used in this system
Assignee: US Philips Corp
•
Filing: 1967-06-07
•
Granted: 1970-10-13
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Expires: 1987-06-07
Abstract
No abstract record available.
Inventors
- 👤 Max Weeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:11
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3069505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |