US3553673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Theft alarms for television sets
Assignee: Individual
•
Filing: 1967-08-22
•
Granted: 1971-01-05
•
Expires: 1987-08-22
Abstract
Abstract AN R-F OSICLLATOR SUPPLIES R-F CURRENT TO AN A-F OSCILLATOR WHICH IS COUPLED TO THE VOICE COIL OF A TELEVISION RECEIVER SET TO PRODUCE AN AUDIBLE SIGNAL. THE R-F OSCILLATOR IS MAINTAINED INOPERATIVE BY CONNECTING A GROUND LEAD TO ADDITIONAL CAPACITANCE AT THE RECEIVER LOCATION. THE A-F OSCILLATOR IS MAINTAINED INOPERATIVE BY A MICROSWITCH WHICH IS NORMALLY HELD OPEN BY PHYSICAL CONTACT WITH THE BACK PANEL OF THE SET. THE CURRENT SUPPLY FROM A SELFCONTAINED BATTERY CAN BE SHUT OFF BY AUTHORIZED PERSONNEL BY ACTUATION OF COMBINATION OF ROTARY SWITCHES.
Inventors
- 👤 David N Fistell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1409
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |