Patent US3439359A successfully refreshed from Google Patents.
US3439359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system for preventing the theet of valuable articles
Assignee: MICHAEL T SLIMAN
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Filing: 1966-01-11
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Granted: 1969-04-15
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Expires: 1986-01-11
Abstract
No abstract record available.
Inventors
- 👤 Michael T Sliman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1409
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
A SYSTEM FOR PROTECTING NORMALLY UNOBSERVED ARTICLES SUCH AS TELEVISION RECEIVERS AND THE LIKE IN LOCATIONS ACCESSIBLE TO THE PUBLIC SUCH AS HOTEL OR MOTEL ROOMS FROM THEFT OR TAMPERING WHEREIN A REMOTE SIGNAL IS PRODUCED BY REMOVAL OR EXCESSIVE MOVEMENT OF THE ARTICLE BY AN UNAUTHORIZED PERSON COMPRISING AT LEAST ONE TELEVISION RECEIVER; A SENSING RESISTANCE ELEMENT DISPOSED IN AT LEAST ONE OF SAID TELEVISION RECEIVERS; A MASTER CONTROL AND ALARM PANEL REMOTELY LOCATED FROM SAID TELEVISION RECEIVERS, SAID MASTER CONTROL AND ALARM PANEL INCLUDING A WHEATSTONE BRIDGE CIRCUIT COMPRISING A PLURALITY OF RESISTANCE ELEMENTS WHICH IS NORMALLY IN AN ELECTRICALLY UNBALANCED CONDITION UNLESS PROPERLY ELECTRICALLY CONNECTED TO ONE OR MORE OF SAID SENSING ELECTRICAL RESISTANCE ELEMENTS DISPOSED IN SAID TELEVISION RECEIVERS; MEANS FOR ELECTRICALY CONNECTING SAID AT LEAST ONE SENSING RESISTANCE ELEMENT TO SAID WHEATSTONE BRIDGE CIRCUIT TO THEREBY ELECTRICALLY BALANCE SAID WHEATSTONE BRIDGE CIRCUIT, AND MEANS RESPONSIVE TO AN ELECTRICAL IMBALANCE SIGNAL IN SAID WHEATSTONE BRIDGE CIRCUIT FOR GIVING AN ALARM UPON REMOVAL OR EXCESSIVE MOVEMENT OF ONE OF SAID TELEVISION RECEIVERS, SAID MEANS RESPONSIVE TO AN ELECTRICAL IMBALANCE IN SAID WHEATSTONE BRIDGE COMPRISES A TRANSISTOR AMPLIFIER ELECTRONIC SWITCHING CIRCUIT AND MEANS RESPONSIVE TO SAID TRANSISTOR SWITCHING CIRCUIT FOR GIVING AN ALARM.
Claim 2
Independent Claim
205 words
A SYSTEM FOR PROTECTING NORMALLY UNOBSERVED ARTICLES SUCH AS TELEVISION RECEIVERS AND THE LIKE IN LOCATIONS ACCESSIBLE TO THE PUBLIC SUCH AS HOTEL OR MOTEL ROOMS FROM THEFT OR TAMPERING WHEREIN A REMOTE SIGNAL IS PRODUCED BY REMOVAL OR EXCESSIVE MOVEMENT OF THE ARTICLE BY AN UNAUTHORIZED PERSON COMPRISING AT LEAST ONE TELEVISION RECEIVER; A SENSING RESISTANCE ELEMENT DISPOSED IN AT LEAST ONE OF SAID TELEVISION RECEIVERS; A MASTER CONTROL AND ALARM PANEL REMOTELY LOCATED FROM SAID TELEVISION RECEIVERS, SAID MASTER CONTROL AND ALARM PANEL INCLUDING A WHEATSTONE BRIDGE CIRCUIT COMPRISING A PLURALITY OF RESISTANCE ELEMENTS WHICH IS NORMALLY IN AN ELECTRICALLY UNBALANCED CONDITION UNLESS PROPERLY ELECTRICALLY CONNECTED TO ONE OR MORE OF SAID SENSING ELECTRICAL RESISTANCE ELEMENTS DISPOSED IN SAID TELEVISION RECEIVERS; MEANS FOR ELECTRICALY CONNECTING SAID AT LEAST ONE SENSING RESISTANCE ELEMENT TO SAID WHEATSTONE BRIDGE CIRCUIT TO THEREBY ELECTRICALLY BALANCE SAID WHEATSTONE BRIDGE CIRCUIT, AND MEANS RESPONSIVE TO AN ELECTRICAL IMBALANCE SIGNAL IN SAID WHEATSTONE BRIDGE CIRCUIT FOR GIVING AN ALARM UPON REMOVAL OR EXCESSIVE MOVEMENT OF ONE OF SAID TELEVISION RECEIVERS, SAID MEANS RESPONSIVE TO AN ELECTRICAL IMBALANCE IN SAID WHEATSTONE BRIDGE COMPRISES A TRANSISTOR AMPLIFIER ELECTRONIC SWITCHING CIRCUIT AND MEANS RESPONSIVE TO SAID TRANSISTOR SWITCHING CIRCUIT FOR GIVING AN ALARM.
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |