Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reissue Patent
2011-08-02
2011-08-02
Nguyen, Quynh H (Department: 2614)
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
C379S377000, C379S382000, C379S372000, C379S373010, C379S387010, C379S399010, C379S412000, C379S413010, C379S413020, C379S442000, C379S443000, C379S418000, C379S252000, C379S163000
Reissue Patent
active
RE042590
ABSTRACT:
The telephone line coupler circuit has a single transmit opto-coupler whose output includes a DC bias component connected to a gate of a line seize switch for connecting a DC line seize load across the ring and tip contacts of the telephone line. The line seize switch is saturated by the transmit opto-coupler bias output and the AC component of the transmit opto-coupler output is sent over the telephone lines. The receive opto-coupler is used both for receiving communications signal and for detecting the ring signal. The band pass filter connected to the output of the receive opto-coupler may be switched to pass a ring signal frequency band or a communications frequency band. The circuit operates using two opto-coupler devices while conventional circuits require four opto-coupler devices.
REFERENCES:
patent: 3829619 (1974-08-01), Close et al.
patent: 3941939 (1976-03-01), Holmes et al.
patent: 4056719 (1977-11-01), Waaben
patent: 4101741 (1978-07-01), Kunstatter
patent: 4203006 (1980-05-01), Mascia
patent: 4282604 (1981-08-01), Jefferson
patent: 4292466 (1981-09-01), Eckel
patent: 4417099 (1983-11-01), Pierce
patent: 4436960 (1984-03-01), Harmon, Jr.
patent: 4558183 (1985-12-01), Corris et al.
patent: 4723267 (1988-02-01), Jones et al.
patent: 4727535 (1988-02-01), Brandt
patent: 4803719 (1989-02-01), Ulrich
patent: 5140631 (1992-08-01), Stahl
patent: 5233649 (1993-08-01), Guerra, Jr.
patent: 5291545 (1994-03-01), Stahl
patent: 5555293 (1996-09-01), Krause
patent: 5751803 (1998-05-01), Shpater
patent: 5923250 (1999-07-01), Pildner et al.
patent: RE39406 (2006-11-01), Shpater
patent: PL 4052 (1992-11-01), None
patent: 2169670 (1997-05-01), None
patent: 2273148 (1997-05-01), None
patent: S55-86253 (1980-03-01), None
patent: S61-30847 (1986-02-01), None
patent: WO 94/03990 (1994-02-01), None
patent: WO 94/06215 (1994-03-01), None
patent: WO 9407319 (1994-03-01), None
Digital Security Controls Ltd. Circuit Diagram DSC 4000 device.
Provisional Spec. of David Scott Whitby, Australia, Jul. 8, 1992.
Encyclopedia of Electronic Circuits, 1991, vol. 3, pp. 619-620 by Graf, Rudolph F.
Defendants' Invalidity Contentions, in the United States District Court for the Eastern District of Texas, Marshall Division, Civil Action No. 2:06-CV-00462 TJW, Aug. 13, 2007.
Protection One's Invalidity Contentions, in the United States District Court for the Eastern District of Texas, Marshall Division, Civil Action No. 2:06-CV-00462 TJW, Jun. 18, 2008.
Monitronics' Invalidity Contentions, in the United States District Court for the Eastern District of Texas, Marshall Division, Civil Action No. 2:06-CV-00462 TJW, Jun. 18, 2008.
Defendants ADT Security Services, Inc. and Digital Security Controls, Ltd.'s First Amended Answer to Plaintiffs' Second Amended Complaint, Affirmative Defenses, Counterclaims, and Jury Demand, in the United States District Court for the Eastern District of Texas, Marshall Division, Civil Action No. 2:06-CV-00462 TJW, Jul. 22, 2008.
Joint Claim Construction and Prehearing Statement, in the United States District Court for the Eastern District of Texas, Marshall Division, Civil Action No. 2:06-CV-00462 TJW, Aug. 12, 2008.
Reasons for Judgment and Judgment, Canadian Federal Court, The Honourable Mr. Justice Martineau, Docket T-426-04, 2009 FC 256, Ottawa, Ontario, Mar. 12, 2009.
Notice of Intent to Issue a Reexam Certificate mailed Sep. 29, 2009 for U.S. Control No. 90/009,004, 12 pgs.
Non-Final Action mailed Dec. 22, 2008 for U.S. Control No. 90/009,004, 12 pgs.
Nguyen Quynh H
Sterne Kessler Goldstein & Fox P.L.L.C.
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