US4417100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency dialer system
Assignee: Metro Tel Corp
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Filing: 1981-07-06
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Granted: 1983-11-22
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Expires: 2001-07-06
Abstract
Abstract The present invention is directed to a means of alerting a distant party through a telephone call and a predetermined alarm that a distressed party has activated a distress button. The distressed party indicates an emergency and summons help by pressing a pad button or by means of a remote transmitter without actually going to a telephone. The transmitter signals a receiver by means of a radio frequency and triggers the receiver so that a predetermined telephone number is dialed and an emergency alert is placed on the line for a predetermined amount of time. After an additional period for verification of any emergency, the time sequence is repeated.
Inventors
- 👤 Alan J. Carlson
- 👤 Venerando J. Indelicato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
156 words
An emergency dialer system comprising an emergency circuit, means for triggering a start signal to activate said emergency circuit, means in said emergency circuit for automatically dialing a predetermined telephone number to cause the telephone at said predetermined telephone number to ring, means for applying a predetermined emergency signal on the telephone line of said predetermined number, first timing means for applying said emergency signal on said telephone line for a first predetermined time interval, means for connecting a busy circuit to said first timing means to inhibit further triggering of new start signals, said first timing means interrupting the emergency signal at the end of said first predetermined time interval to permit verification of an emergency, said verification interruption being for a second predetermined time interval, means for resuming the automatic dialing if there is no verification within said second predetermined time interval, said automatic dialing and subsequent verification interruption being repeated until verification occurs.
Claim 2
Dependent Claim
156 words
An emergency dialer system comprising an emergency circuit, means for triggering a start signal to activate said emergency circuit, means in said emergency circuit for automatically dialing a predetermined telephone number to cause the telephone at said predetermined telephone number to ring, means for applying a predetermined emergency signal on the telephone line of said predetermined number, first timing means for applying said emergency signal on said telephone line for a first predetermined time interval, means for connecting a busy circuit to said first timing means to inhibit further triggering of new start signals, said first timing means interrupting the emergency signal at the end of said first predetermined time interval to permit verification of an emergency, said verification interruption being for a second predetermined time interval, means for resuming the automatic dialing if there is no verification within said second predetermined time interval, said automatic dialing and subsequent verification interruption being repeated until verification occurs.
Claim 3
Dependent Claim
18 words
An emergency dialer system as claimed in claim 1 wherein a Darlington pair is included in the circuit.
Claim 4
Dependent Claim
28 words
An emergency dialer system as claimed in claim 2, wherein said Darlington pair controls seizure of a central office line to produce a dial tone on the line.
Claim 5
Dependent Claim
24 words
An emergency dialer system as claimed in claim 3, wherein said first timing means controls the length of time for the automatic dialing mechanism.
Claim 6
Dependent Claim
20 words
An emergency dialer system as claimed in claim 4, wherein said verification interruption is controlled by a second timing means.
Claim 7
Dependent Claim
23 words
An emergency dialer system as claimed in claim 5, wherein the automatic dialing and verification interruption continues until a reset circuit is activated.
Claim 8
Dependent Claim
18 words
An emergency dialer system as claimed in claim 6, wherein said automatic dialing is at one minute intervals.
Claim 9
Dependent Claim
21 words
An emergency dialer system as claimed in claim 7, wherein said second timing means interrupts the automatic dialing for five minutes.
Claim 10
Dependent Claim
17 words
An emergency dialer system as claimed in claim 8, wherein said emergency signal is a warble tone.
Claim 11
Dependent Claim
22 words
An emergency dialer system as claimed in claim 9, wherein the emergency circuit is started by a push button on a pad.
Claim 12
Dependent Claim
20 words
An emergency dialer system as claimed in claim 9, wherein the emergency circuit is started by a remote control circuit.
Claim 13
Dependent Claim
31 words
An emergency dialer system as claimed in claim 11, wherein said remote control circuit must be actuated more than once within a prescribed time period in order to activate the system.
Claim 14
Dependent Claim
20 words
An emergency dialer system as claimed in claim 9, wherein a tape cassette is adapted to give said emergency signal.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |