US3720937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained unauthorized entry alarm
Assignee: Individual
•
Filing: 1971-07-29
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Granted: 1973-03-13
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Expires: 1991-07-29
Abstract
Abstract The entry alarm of this invention is especially useful in apartments where ease of installation and removal are highly desirable. Specifically, the invention comprises a battery operated alarm system which is completely contained within a inverted U-shaped assembly designed to fit quite simply over the top of a door and to be held in place with ordinary double-sided tape. The system includes a sensor which sets off a battery operated alarm unless a code-operated device on the outside of the door is correctly manipulated prior to the opening of the door.
Inventors
- 👤 A Lang
- 👤 G Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:54
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
In a self-contained electrically operated alarm system for signaling the unauthorized opening of a door which system includes a sensor means for signaling the door-open condition and a code operated means on the outside of the door which when properly manipulated permits the opening of the door without said sensor means actuating the alarm wherein the improvement comprises first housing means, second housing means, interconnecting means between said first and second housing means which can be placed around one edge of the door with said first and second housing means on opposite sides of the door, said interconnecting means of a thickness less than that which would prevent an ordinary door from closing when said interconnecting means is in place, said first housing means containing the electrical power supply, alarm means and sensor means, said second housing means containing said code operated means.
Claim 2
Dependent Claim
143 words
In a self-contained electrically operated alarm system for signaling the unauthorized opening of a door which system includes a sensor means for signaling the door-open condition and a code operated means on the outside of the door which when properly manipulated permits the opening of the door without said sensor means actuating the alarm wherein the improvement comprises first housing means, second housing means, interconnecting means between said first and second housing means which can be placed around one edge of the door with said first and second housing means on opposite sides of the door, said interconnecting means of a thickness less than that which would prevent an ordinary door from closing when said interconnecting means is in place, said first housing means containing the electrical power supply, alarm means and sensor means, said second housing means containing said code operated means.
Claim 3
Dependent Claim
143 words
In a self-contained electrically operated alarm system for signaling the unauthorized opening of a door which system includes a sensor means for signaling the door-open condition and a code operated means on the outside of the door which when properly manipulated permits the opening of the door without said sensor means actuating the alarm wherein the improvement comprises first housing means, second housing means, interconnecting means between said first and second housing means which can be placed around one edge of the door with said first and second housing means on opposite sides of the door, said interconnecting means of a thickness less than that which would prevent an ordinary door from closing when said interconnecting means is in place, said first housing means containing the electrical power supply, alarm means and sensor means, said second housing means containing said code operated means.
Claim 4
Dependent Claim
143 words
In a self-contained electrically operated alarm system for signaling the unauthorized opening of a door which system includes a sensor means for signaling the door-open condition and a code operated means on the outside of the door which when properly manipulated permits the opening of the door without said sensor means actuating the alarm wherein the improvement comprises first housing means, second housing means, interconnecting means between said first and second housing means which can be placed around one edge of the door with said first and second housing means on opposite sides of the door, said interconnecting means of a thickness less than that which would prevent an ordinary door from closing when said interconnecting means is in place, said first housing means containing the electrical power supply, alarm means and sensor means, said second housing means containing said code operated means.
Claim 5
Dependent Claim
19 words
An alarm system according to claim 1 wherein said interconnecting means is laminated over at least a portion thereof.
Claim 6
Dependent Claim
15 words
An alarm in accordance with claim 1 wherein said interconnecting means is made of steel.
Claim 7
Dependent Claim
66 words
An alarm system according to claim 1 wherein said code-operated means operates an electrical switch in circuit with said circuit elements contained in said first housing means, and wherein electrical connection means between said code-operated means and said circuit elements is coextensive with at least a portion of said inTerconnecting means on the outside of the door and that portion around one edge of the door.
Claim 8
Dependent Claim
33 words
An alarm system according to claim 2 wherein there is included electrical connection means extending between said first and second housing means, said electrical connection means placed between laminations of said interconnecting 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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |