Clark D Johnson, 65767 Johnson St, Anoka, MN 55303

2002003, Mar 14, 2002

Apr 30, 2001

09/819079

Clark Johnson - Minneapolis MN, US
Richard Solomon - Monson MA, US
Tice Deyoung - Fairfax VA, US
David Farber - Landenberg PA, US

H04L012/16

370/260000, 370/202000, 370/352000

In a telephone conferencing system, a digital communication network such as the Internet is used to establish and control the telephone connections between multiple conferees with the telephone network being the means of exchanging verbal information. Each conferee may have a computer connected to the digital network, and each has an independent telephone instrument connected to the public switched telephone network. An in-charge conferee utilizes his computer containing appropriate software to initiate the conference and to control the participation of the conferees. The in-charge conferee sends digital control signals to a switch interface controlling a telephone switch as a gateway to the telephone network using SS7 control signals. These SS7 control signals include the commands by which the conferee telephones are rung up, brought on line, or dropped from the conference. The switch provides telephone status information back over the digital network, and the in-charge conferee, as well as other conferees provided with appropriate software, display this status information on their PC monitors.

6266328, Jul 24, 2001

Jun 3, 2000

9/587080

Clark E. Johnson - Minneapolis MN
Richard J. Solomon - Monson MA
Tice F. DeYoung - Fairfax VA
David J. Farber - Landenberg PA

Caritas Technologies, Inc. - Minneapolis MN

H04L 1216

370260

In a telephone conferencing system, a digital communication network such as the Internet is used to establish and control the telephone connections between multiple conferees with the telephone network being the means of exchanging verbal information. Each conferee may have a computer connected to the digital network, and each has an independent telephone instrument connected to the public switched telephone network. An in-charge conferee utilizes his computer containing appropriate software to initiate the conference and to control the participation of the conferees. The in-charge conferee sends digital control signals to a switch interface controlling a telephone switch as a gateway to the telephone network using SS7 control signals. These SS7 control signals include the commands by which the conferee telephones are rung up, brought on line, or dropped from the conference. The switch provides telephone status information back over the digital network, and the in-charge conferee, as well as other conferees provided with appropriate software, display this status information on their PC monitors.

4451858, May 29, 1984

Jan 18, 1982

6/339987

Clark E. Johnson - Minneapolis MN

Vertimag Systems Corporation - Minneapolis MN

G11B 500

360 32

An arrangement for recording an analog signal onto magnetic tape in which the analog signal modulates a square wave bias field by moving the negative-going transition of the square wave so that the average of the positive portion and negative portion of the square wave, equals the instantaneous value of the analog signal. The period of the total square wave, is maintained constant. The analog signal is compared to a periodic triangular-shaped wave, in a comparator, and the output of the comparator becomes switched in polarity whenever the analog modulating signal is equal in value to the instantaneous value of the triangular wave. The point at which polarity is switched corresponds to an intersection of the analog signal superimposed on the triangular wave. The resultant modulated square wave is applied to a recording head.

6072780, Jun 6, 2000

Dec 16, 1998

9/212786

Clark E. Johnson - Minneapolis MN
Richard J. Solomon - Monson MA
Tice F. DeYoung - Fairfax VA
David J. Farber - Landenberg PA

Caritas Technologies, Inc. - Minneapolis MN

H04L 1216
H04Q 514

370260

In a telephone conferencing system, a digital communication network is used to establish and control the telephone connections between multiple conferees with the telephone network being the means of exchanging verbal information. Each conferee may have a computer connected to the digital network, and each has an independent telephone instrument connected to the public switched telephone network. An in-charge conferee utilizes his computer containing appropriate software to initiate the conference and to control the participation of the conferees. The in-charge conferee sends digital control signals to a switch interface controlling a telephone switch as a gateway to the telephone network. These control signals include the commands by which the conferee telephones are rung up, brought on line, or dropped from the conference. The switch provides telephone status information back over the digital network, and the in-charge conferee, as well as other conferees if provided with appropriate software, display this status information on their PC monitors.

4818119, Apr 4, 1989

Aug 3, 1987

7/080979

Theodore Busch - Minneapolis MN
Clark E. Johnson - Denver CO

Rastech, Inc. - Minneapolis MN

G01K 114
G01K 1106

374208

A temperature warning device for monitoring the temperature of an article and for providing a dependable signal that a preselected temperature has been reached. The device includes an axially extending bore into which a heat responsive element, a driver, and a sensing indicator are arranged. The bore is normally sealed by a closure plug to prevent failure due to contaminants. Upon reaching a preselected temperature the element exerts force against the driver which in turn forcibly removes the closure plug, exposing the indicator.

4492990, Jan 8, 1985

Feb 28, 1983

6/470435

Clark E. Johnson - Minneapolis MN

Vertimag Systems Corporation - Minneapolis MN

G11B 500
G11B 509

360 32

A system for recording audio and video signals on magnetic and other media including a generator of a time-reference square-wave signal, a circuit for combining the dc level with an input audio or video signal, and a sampling circuit wherein the sum of the input signal and the dc level are sampled in synchronism with the square-wave signal. The time-reference signal and a second signal, delayed therefrom, are then recorded by saturation of the magnetic medium in both positive and negative directions. The amount of delay between the two recorded signals is proportional to the amplitudes of the successive samples of the sampling circuit. After playback, the original input signal is retrieved from the recorded signals by comparing successive samples with a succession of ramp waveforms and filtering out the sampling spectrum and the dc level.