US4117467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper resistant alarm annunciator
Assignee: Individual
•
Filing: 1977-07-11
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Granted: 1978-09-26
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Expires: 1997-07-11
Abstract
Abstract A tamper-resistant box for protecting the hooters of burglar and fire alarm systems. The box has a fixed frame to be attached to a support, such as a building, and a moveable cover separated slightly from the frame by interposed springs. Microinterrupters are sensitive to any movement of the moveable cover relative to the frame to energize the hooter when the moveable cover is touched.
Inventors
- 👤 Rene Liou Tchen San
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/02; G08B29/04; G08B29/046; G08B3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A tamper-resistant box for an alarm annunciator comprising a frame adapted to be secured to a support, a moveable cover, a plurality of resilient elements interposed between said frame and said cover for resiliently supporting said cover in slightly spaced relation from said frame, and at least one microinterrupter position to be responsive to movement of the cover relative to the frame to energize the alarm annunciator.
Claim 2
Dependent Claim
67 words
A tamper-resistant box for an alarm annunciator comprising a frame adapted to be secured to a support, a moveable cover, a plurality of resilient elements interposed between said frame and said cover for resiliently supporting said cover in slightly spaced relation from said frame, and at least one microinterrupter position to be responsive to movement of the cover relative to the frame to energize the alarm annunciator.
Claim 3
Dependent Claim
15 words
A tamper resistant box as recited in claim 1 wherein said resilient elements are springs.
Claim 4
Dependent Claim
34 words
A tamper resistant box as recited in claim 2 wherein the springs are coil springs, each having one end attached to said frame and the other end received in a boss in said cover.
Claim 5
Dependent Claim
17 words
A tamper resistant box as recited in claim 1 wherein the cover is larger than the frame.
Claim 6
Dependent Claim
22 words
A tamper resistant box as recited in claim 1 wherein said cover has openings for propagating sound generated by the alarm annunciator.
Claim 7
Dependent Claim
16 words
A tamper resistant box as recited in claim 4 wherein the alarm annunciator comprises a hooter.
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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |