US3801971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone alarm system
Assignee: Individual
•
Filing: 1972-10-11
•
Granted: 1974-04-02
•
Expires: 1992-10-11
Abstract
Abstract An alarm system is disclosed having a condition responsive means therein which completes a circuit through a telephone and an auxiliary telephone ringing power supply upon the occurrence of an alarm condition. The circuit includes an interrupter to cause the telephone to ring in response to the alarm condition.
Inventors
- 👤 J Stendig
- 👤 C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:21
CPC Classifications
G; G08; G08B; G08B19/00; H; H04; H04M; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
In a telephone system including an operable telephone, an alarm system comprising: a condition responsive switch means which closes in response to an alarm condition; an auxiliary telephone ringing power supply; means connecting the telephone in a series circuit with the condition responsive switch means and the auxiliary telephone ringing power supply to thereby establish current flow therethrough during closure of the condition responsive switch means; and intermittent interrupter means connected in said series circuit for intermittently open circuiting same during closure of the condition responsive switch means to thereby ring the telephone as an alarm indication.
Claim 2
Dependent Claim
97 words
In a telephone system including an operable telephone, an alarm system comprising: a condition responsive switch means which closes in response to an alarm condition; an auxiliary telephone ringing power supply; means connecting the telephone in a series circuit with the condition responsive switch means and the auxiliary telephone ringing power supply to thereby establish current flow therethrough during closure of the condition responsive switch means; and intermittent interrupter means connected in said series circuit for intermittently open circuiting same during closure of the condition responsive switch means to thereby ring the telephone as an alarm indication.
Claim 3
Dependent Claim
31 words
The invention of claim 1 wherein the auxiliary telephone ringing power supply includes a capacitor serially connected with the condition responsive switch means and a rectifier means for charging the capacitor.
Claim 4
Dependent Claim
20 words
The invention of claim 2 including an energized a.c. receptacle box connected to the rectifier means for charging said capacitor.
Claim 5
Dependent Claim
22 words
The invention of claim 3 including an isolation transformer for transmitting a signal from the a.c. receptacle box to the rectifier means.
Claim 6
Dependent Claim
15 words
The invention of claim 4 wherein the isolation transformer is retained by said receptacle box.
Claim 7
Dependent Claim
28 words
The invention of claim 2 including a telephone wall box located proximate the telephone and wherein the capacitor and rectifier means are contained within said telephone wall box.
Claim 8
Dependent Claim
28 words
The invention of claim 1 wherein the intermittent interrupter is a thermally responsive type which opens upon being heated to a predetermined temperature due to current flow therethrough.
Claim 9
Dependent Claim
30 words
The invention of claim 1 including a remotely positioned alarm condition monitor, and switch means for selectively connecting the condition responsive switch means to the remotely positioned alarm condition monitor.
Claim 10
Dependent Claim
21 words
The invention of claim 8 wherein the switch means disconnects the condition responsive switch means from the telephone ringing current supply.
Claim 11
Dependent Claim
20 words
The invention of claim 8 wherein the remotely positioned alarm condition monitor includes a Power supply and an illuminable indicator.
Claim 12
Dependent Claim
28 words
The invention of claim 10 wherein the remotely positioned alarm condition monitor is a telephone switchboard which includes means for selectively connecting the telephone to outside telephone lines.
Claim 13
Dependent Claim
33 words
The invention of claim 1 including another condition responsive switch means in parallel with said condition responsive switch means, and a thermally responsive interrupter in series with said another condition responsive switch means.
References Cited (Backward Citations)
US2000185A
Cited
US2439502A
Cited
US2520340A
Cited
US3255441A
Cited
US3274578A
Cited
US3441929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |