Patent US4987406A successfully refreshed from Google Patents.
US4987406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security system for electrical appliances and other items with electrical circuitry
Assignee: Individual
•
Filing: 1989-11-17
•
Granted: 1991-01-22
•
Expires: 2009-11-17
Abstract
Abstract A security system for electrical appliances and other items with electrical circuitry includes a signal source operating within a predetermined zone. A receiver within the appliance or other item receives the signal and activates a circuit thereby permitting operability of the appliance or other item when the signal is received. The appliance or other item is disabled upon removal from the zone.
Inventors
- 👤 Philip L. Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:54
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1409; G08B13/1418; B; B60; B60R; B60R25/00; B60R25/01; B60R25/04; G08B13/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A security system for a portable device with electrical circuitry comprising: a portable signal source for emitting a coded signal over a predetermined range; a receiver for said emitted signal attached to said electrical circuitry of said portable device; normally open switch means comprising a circuit actuated by said receiver, said means being activated and closed thereby rendering said portable device operable, when said portable signal source is within said predetermined range; and a battery for operating said electrical circuitry; said switch means "when deactuated " preventing drain on said battery.
Claim 2
Dependent Claim
91 words
A security system for a portable device with electrical circuitry comprising: a portable signal source for emitting a coded signal over a predetermined range; a receiver for said emitted signal attached to said electrical circuitry of said portable device; normally open switch means comprising a circuit actuated by said receiver, said means being activated and closed thereby rendering said portable device operable, when said portable signal source is within said predetermined range; and a battery for operating said electrical circuitry; said switch means "when deactuated " preventing drain on said battery.
References Cited (Backward Citations)
US3907060A
Cited
US4023138A
Cited
US4740775A
Cited
US4740775B1
Cited
US4897644A
Cited
US4672375A
Cited
US4761645A
Cited
US4811013A
Cited
US4791409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |