Patent US3852537A successfully refreshed from Google Patents.
US3852537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone station disconnect device
Assignee: SAN BAR CORP
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Filing: 1973-02-22
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Granted: 1974-12-03
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Expires: 1993-02-22
Abstract
Abstract A station disconect device intended for installation and use at each of several subscriber stations in a multi-party telephone system, is disclosed. The station disconnect device serves to permit the remote connection or disconnection of each station. A relay controlled contact is connected in either or both of the conventional pair of conductors that connect a subscriber''s telephone to the tip and ring conductors extending to a central office facility. The relay is connected to be actuated by a frequency responsive relay control circuit including detector circuits that are responsive to a pair of preselected frequencies that are simultaneously transmitted from the central office facility to have the individual subscriber stations remotely connected or disconnected.
Inventors
- 👤 O Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:10
CPC Classifications
H; H04; H04Q; H04Q5/00; H04Q5/02; H04Q5/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A disconnect device intended for use with individual subscriber telephones in a multi-subscriber telephone system for enabling remote connection or disconnection of the individual subscriber telephones to a single pair of line conductors by which telephone service is extended from a central facility to all subscribers, said device comprising: first means for being operated to complete or break an electrical connection between at least one of said pair of line conductors and a subscriber telephone, said first means being electrically installed between at least one of said pair of line conductors and said telephone; and second means for operating said first means in response to the concurrent application of two predetermined frequency signals for a predetermined period.
Claim 2
Dependent Claim
117 words
A disconnect device intended for use with individual subscriber telephones in a multi-subscriber telephone system for enabling remote connection or disconnection of the individual subscriber telephones to a single pair of line conductors by which telephone service is extended from a central facility to all subscribers, said device comprising: first means for being operated to complete or break an electrical connection between at least one of said pair of line conductors and a subscriber telephone, said first means being electrically installed between at least one of said pair of line conductors and said telephone; and second means for operating said first means in response to the concurrent application of two predetermined frequency signals for a predetermined period.
Claim 3
Dependent Claim
37 words
The disconnect device defined by claim 1, said first means including a relay having a contact connected in series between one of said line conductors and said subscriber telephone for completing or breaking an electrical connection therebetween.
Claim 4
Dependent Claim
98 words
The disconnect device defined by claim 1, said first means including a relay having a pair of relay coils and a relay contact connected in series between one of said line conductors and said subscriber telephone, energization of a first one of said pair of coils causing closure of said relay contact to complete an electrical connection between said one line conductor and said subscriber telephone, and energization of a second one of said pair of coils causing opening of said relay contact to break any electrical connection therethrough between said one line conductor and said subscriber telephone.
Claim 5
Dependent Claim
42 words
The disconnect device defined by claim 1, said second means including: control means for selectively enabling operation of said first means; and frequency sensitive means for actuating said control means in response to the concurrent application of said two predetermined frequency signals.
Claim 6
Dependent Claim
76 words
The disconnect device defined by claim 4, said frequency sensitive means including: first and second filter circuits each tuned for one of said predetermined frequencies; gating means connected to said first filter circuit for being actuated by the application of first frequency signals transmitted through said first filter circuit; third means for applying second frequency signals to said control means, said third means being enabled by said gating means when actuated by said first frequency signals.
Claim 7
Dependent Claim
113 words
A disconnect device defined by claim 1, said second means including: a first filter circuit tuned for a first one of said predetermined frequency signals; a second filter circuit tuned for a second one of said predetermined frequency signals; a first gating circuit connected to be actuated by said first frequency signals when transmitted through said first filter circuit, said first gating circuit providing a gating signal; a second gating circuit connected to permit operation of said first means in response to the application thereto of said second frequency signals; and means responsive to said gating signal from said first gating circuit for transmitting said second frequency signals to said second gating circuit.
Claim 8
Dependent Claim
79 words
The disconnect device defined by claim 6, said second means further including: first timing means for setting a first time period during which said first frequency signals must be continually applied through said first filter circuit to said first gating circuit to cause actuation thereof; and second timing means for setting a second time period during which said second frequency signals must be continually applied from said second filter circuit to said second gating circuit to cause actuation thereof.
Claim 9
Dependent Claim
71 words
The disconnect device defined by claim 1 further including: first and second storage means for storing electrical energy applied thereto; switch meanS for applying electrical energy from said line conductors to either said first or second storage means; means for controlling said switch means to apply said electrical energy to said first or second storage means; and bridge menas for coupling electrical energy from said line conductors to said switch means.
Claim 10
Dependent Claim
117 words
The disconnect device defined by claim 2, said relay further including a pair of relay coils, energization of a first one of said pair of relay coils causing closure of said relay contact to complete an electrical connection between one of said line conductors and said subscriber telephone, and energization of a second one of said pair of relay coils causing opening of said relay contact to break any electrical connection therethrough between said one line conductor and said subscriber telephone; and said second means including control means for selectively enabling energization of either said first or second relay coils, and frequency sensitive means for actuating said control means in response to said two predetermined frequency signals.
Claim 11
Dependent Claim
76 words
The disconnect device defined by claim 9, said frequency sensitive means including: first and second filter circuits each tuned for one of said predetermined frequencies; gating means connected to said first filter circuit for being actuated by the application of first frequency signals transmitted through said first filter circuit; third means for applying second frequency signals to said control means, said third means being enabled by said gating means when actuated by said first frequency signals.
Claim 12
Dependent Claim
77 words
The disconnect device defined by claim 10, said second means further including: first timing means for setting a first time period during which said first frequency signal must be continually applied through said first filter circuit to said gating circuit to cause actuation thereof; and second timing means for setting a second time period during which said second frequency signal must be continually applied from said second filter circuit to said control means to cause operation thereof.
Claim 13
Dependent Claim
65 words
The disconnect device defined by claim 11 further including: first and second storage means for storing energy applied thereto; means for selectively applying electrical energy to either said first or second storage means; and means connecting said first and second storage device to said first and second relay coils, respectively, to energize said first and second relay coils under the control of said control means.
Claim 14
Dependent Claim
57 words
The disconnect device defined by claim 12, said means for selectively applying electrical energy to either said first or second storage means including: switching means for connecting said line conductor to either said first or second storage means; and means for operating said switching means to connect said line conductors to said first or second storage means.
Claim 15
Dependent Claim
111 words
The disconnect device defined by claim 13, said switching means including: a diode connected to said line conductors for coupling electrical energy therefrom, and a switching relay contact having first and second positions respectively serving to enable said electrical energy to be applied to said first and second storage means; and said means for operating said switching means including another pair of relay coils which control said switching relay contact to be in said first or second positions, said another pair of relay coils being connected to be individually energized under the control of said control means and concurrently with said first and second relay coils, respectively, of said first means.
Claim 16
Dependent Claim
113 words
The disconnect device defined by claim 3, said second means including: a first filter circuit tuned for a first one of said predetermined frequency signals; a second filter circuit tuned for a second one of said predetermined frequency signals; a first gating circuit connected to be actuated by said first frequency signals when transmiTted through said first filter circuit, said first gating circuit providing a gating signal; a second gating circuit connected to permit operation of said first means in response to the application thereto of said second frequency signals; and means responsive to said gating signals from said first gating circuit for transmitting said second frequency signals to said second gating circuit.
Claim 17
Dependent Claim
79 words
The disconnect device defined by claim 15, said second means further including: first timing means for setting a first time period during which said first frequency signals must be continually applied through said first filter circuit to said first gating circuit to cause actuation thereof; and second timing means for setting a second time period during which said second frequency signals must be continually applied from said second filter circuit to said second gating circuit to cause actuation thereof.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |