US4835518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active entry delay device
Assignee: Individual
•
Filing: 1987-01-30
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Granted: 1989-05-30
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Expires: 2007-01-30
Abstract
Abstract An active entry delay device which uses a wired or wireless momentary switch to be placed at edge of door or car door, so that the entry delay device can be initiated by turning on the switch; if the switch is not turned on before opening of door/car door, there will not be any entry delay, and alarm system will be triggered to sound alarm immediately.
Inventors
- 👤 Shih-Ming Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:39
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
An alarm system comprising latch circuit means operable when triggered to energize an alarm, detecting means operable when enabled to trigger said latch circuit means to energize said alarm in response to the opening of a door, a momentary switch input terminal, and means responsive to a momentary signal applied to said momentary switch input terminal to disable said detecting means for first predetermined time interval, and means responsive to an input signal on said momentary switch input terminal exceeding in a second predetermined time interval to trigger said latch circuit means to energize said alarm.
Claim 2
Dependent Claim
96 words
An alarm system comprising latch circuit means operable when triggered to energize an alarm, detecting means operable when enabled to trigger said latch circuit means to energize said alarm in response to the opening of a door, a momentary switch input terminal, and means responsive to a momentary signal applied to said momentary switch input terminal to disable said detecting means for first predetermined time interval, and means responsive to an input signal on said momentary switch input terminal exceeding in a second predetermined time interval to trigger said latch circuit means to energize said alarm.
Claim 3
Dependent Claim
33 words
An alarm system as recited in claim 1 for an automotive vehicle, wherein said detecting means is responsive to the opening of the door of said vehicle to trigger said latch circuit means.
Claim 4
Dependent Claim
29 words
An automotive vehicle alarm system as recited in claim 2, wherein said detecting means is operable in response to vibration of said vehicle to trigger said latch circuit means.
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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |