US3968485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burglar warning device
Assignee: Individual
•
Filing: 1975-07-02
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Granted: 1976-07-06
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Expires: 1995-07-02
Abstract
Abstract A twine or cord is stretched across an entrance and secured at one end to one side of the entrance and at the other end linked loosely to an electric light switch near the other side of the entrance so that upon opening the entrance by way of a door by burglar or intruder the switch is activated by a pull on the cord, and thence the switch, and thereafter the link slips off the switch to prevent breakage of the cord.
Inventors
- 👤 Harry I. DeHart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:36
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A burglar warning device to be installed across a doorway or the like and activated by the opening of the door comprising in combination a cord or line to be stretched across the doorway, means at one end of the cord for securing to a fixed position on said doorway, means at the other end for loosely engaging a light control switch, and means for directing the line in a vertically downward direction to assure an upward pull on said switch.
Claim 2
Dependent Claim
81 words
A burglar warning device to be installed across a doorway or the like and activated by the opening of the door comprising in combination a cord or line to be stretched across the doorway, means at one end of the cord for securing to a fixed position on said doorway, means at the other end for loosely engaging a light control switch, and means for directing the line in a vertically downward direction to assure an upward pull on said switch.
Claim 3
Dependent Claim
24 words
Warning device according to claim 1 wherein the said means at said other end of the cord comprises a ring engaging the said switch.
Claim 4
Dependent Claim
43 words
Warning device according to claim 1 wherein the means at said other end of the cord comprises a ring connected to said cord and to a short length of cord connected to a pair of rings for engaging a pair of light switches.
Claim 5
Dependent Claim
26 words
Warning device according to claim 1 wherein said means for directing a cord in a vertically downward direction comprises a screw hook engaging a door facing.
Claim 6
Dependent Claim
32 words
Warning device according to claim 1 wherein the door is provided with a hinge and wherein the means at the one end of the cord comprises a ring for engaging said hinge.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |