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US4772879A
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Motion sensing alarm
Assignee: HARRISON SYDNEY 316 - 6391 MINORU BLVD RICHMOND BRITISH COLUMBIA CANADA V6Y 1Y7
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Filing: 1986-12-22
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Granted: 1988-09-20
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Expires: 2006-12-22
Abstract
Abstract A motion sensing alarm is disclosed. It is comprised of a time delayed switching circuit connected between a supply circuit and an electronic logic circuit. A triggering circuit is connected between the switching circuit and a false triggering circuit and the electronic logic circuit. An alarm initiating circuit is connected between the electronic logic circuit and an alarm.
Inventors
- 👤 Edward A. Hein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:39
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1436; B; B60; B60R; B60R25/00; B60R25/10; B60R25/1004; B60R25/1006; B60R25/1007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A motion sensing alarm, comprising: time delayed circuit means connected between a supply means via a switch and a first input of said electronic logic circuit means; sensor means comprising a thin metallic wire having a weight at its distal end, said wire being disposed in a generally central position within a contact making element until motion is detected, said wire being connected between said switch and said time delay circuit means and said contact making element being connected to a second input of said electronic logic circuit means; alarm initiating circuit means connected to said electronic logic circuit means; false triggering circuit connected between said electronic logic circuit means and said alarm initiating circuit means; and alarm means connected at the output of said electronic logic circuit means.
Claim 2
Dependent Claim
129 words
A motion sensing alarm, comprising: time delayed circuit means connected between a supply means via a switch and a first input of said electronic logic circuit means; sensor means comprising a thin metallic wire having a weight at its distal end, said wire being disposed in a generally central position within a contact making element until motion is detected, said wire being connected between said switch and said time delay circuit means and said contact making element being connected to a second input of said electronic logic circuit means; alarm initiating circuit means connected to said electronic logic circuit means; false triggering circuit connected between said electronic logic circuit means and said alarm initiating circuit means; and alarm means connected at the output of said electronic logic circuit means.
Claim 3
Dependent Claim
122 words
A motion sensing alarm as defined in claim 1 wherein said electronic logic circuit means comprises a first NAND gate having a first and a second input and having an output connected to inputs of a second NAND gate, said second NAND gate being connected to said flase triggering circuit means and a first input of a third NAND gate via a diode, said third NAND gate having a resistor connected between its output and its second input and a capacitor connecting said resistor to ground so as to form said alarm initiating circuit means, the output of said third NAND gate being connected being connected to the input of a fourth NAND gate with its output connected to said alarm means.
Claim 4
Dependent Claim
22 words
A motion sensing alarm as defined in claim 2 further comprising stabilizing circuit means connected between said contact making element and ground.
Claim 5
Dependent Claim
23 words
A motion sensing alarm as defined in claim 3 wherein said stabilizing circuit means comprises a resistor connected in parallel with a capacitor.
Claim 6
Dependent Claim
24 words
A motion sensing alarm as defined in claim 4 wherein said time delay circuit means comprises a resistor connected in series with a capacitor.
Claim 7
Dependent Claim
27 words
A motion sensing alarm as defined in claim 5 wherein said alarm means comprises a buzzer connected between the output of said fourth NAND gate and ground.
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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |