US3822364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode selector for telephone station sets
Assignee: Nortel Networks Technology Corp
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Filing: 1973-02-05
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Granted: 1974-07-02
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Expires: 1993-02-05
Abstract
Abstract A mode selector for connecting various electronic attachment circuits to a telephone line under control of a telephone station set. A single set of make contacts, forming part of the hookswitch contacts generally available in telephone station sets, is used in conjunction with the mode selector circuitry to perform the dual functions of releasing said attachment circuit from the telephone station set while transferring control from said attachment circuit to the conventional station set when the handset is taken off-hook, and controlling the hold or ''''A'''' lead operation used on conventional key-telephone station sets. The established connection may be released by placing the hand set on-hook, if the station handset is in use, or by disconnecting said attachment circuit from the telephone line if said attachment circuit is in use as the call is completed.
Inventors
- 👤 A Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/6033; H04M1/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
214 words
A telephone station comprising: a telephone set having first and second hook-switch make contacts, the first hook-switch make contacts for connecting the telephone set to a telephone line when the set is in an off-hook condition, the set also having a control lead for reflecting the condition of said telephone set; an attachment for alternate connection to said telephone line; and a mode selector, for controlling the alternate connection of the attachment to the telephone line, including: a first relay in shunt with said second hook-switch make contacts so that the first relay is released when the telephone set is in an off-hook condition; the first relay including: first make contacts for connecting the attachment to the telephone line, second make contacts for holding the relay in an actuated condition, and third make and first break contacts in series connection across said second hook-switch make contacts, the junction of the third make and first break contacts being connected to the control lead to establish a connection to the control lead through the first break contacts and the second hookswitch make contacts when the telephone set is in an off-hook condition, and to establish an alternate connection to the control lead through the third make contacts when the telephone set is in an on-hook condition.
Claim 2
Dependent Claim
214 words
A telephone station comprising: a telephone set having first and second hook-switch make contacts, the first hook-switch make contacts for connecting the telephone set to a telephone line when the set is in an off-hook condition, the set also having a control lead for reflecting the condition of said telephone set; an attachment for alternate connection to said telephone line; and a mode selector, for controlling the alternate connection of the attachment to the telephone line, including: a first relay in shunt with said second hook-switch make contacts so that the first relay is released when the telephone set is in an off-hook condition; the first relay including: first make contacts for connecting the attachment to the telephone line, second make contacts for holding the relay in an actuated condition, and third make and first break contacts in series connection across said second hook-switch make contacts, the junction of the third make and first break contacts being connected to the control lead to establish a connection to the control lead through the first break contacts and the second hookswitch make contacts when the telephone set is in an off-hook condition, and to establish an alternate connection to the control lead through the third make contacts when the telephone set is in an on-hook condition.
Claim 3
Dependent Claim
105 words
A telephone station as defined in claim 1 in which the mode selector further includes: a second relay connected in series with the second make contacts of the first relay, the second relay including make contacts connected in series with the second hook-switch make contacts across the first relay; and a first momentary make contact switch, connected in shunt with the series combination of the second relay and the second make contacts of the first relay, the first momentary make contact switch also being connected in series with the first relay across a source of voltage to initiate operation of the relay upon actuation thereof.
Claim 4
Dependent Claim
41 words
A telephone station as defined in claim 2 in which the mode selector further includes: a second momentary make contact switch connected in shunt with the first relay to forcibly release the first relay and disconnect the attachment upon operation thereof.
References Cited (Backward Citations)
US3475557A
Cited
US3517137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |