Harry Kent Rasmussen

US Patent:

41339851, Jan 9, 1979

Filed:

Oct 17, 1977

Appl. No.:

5/842569

Inventors:

Harry R. Rasmussen - Tacoma WA
Gene A. Kimzey - Puyallup WA
Robert D. Hailey - San Jose CA

Assignee:

Crest Industries, Inc. - Puyallup WA

International Classification:

H04M 100

US Classification:

179 99

Abstract:

To convert a multiple line, multiple telephone set installation into a key telephone system, a control unit is provided at each telephone set. The control unit includes a regulated power supply, a control circuit, pushbutton line select and hold switches, and indicator lights packaged in a compact assembly which can be readily attached to the base of a standard telephone set or mounted separately. Electrically controlled switching devices within each control circuit respond to the pushbutton line select switches to couple the telephone set to a selected one of the lines and automatically disconnect the set from the line when the call has been completed. An incoming ringing signal on any one of the telephone lines is detected by the control circuit and the ringing signal is automatically applied to the bell of the telephone set. A line on which a call is in progress may be placed in a hold condition by operating the hold select button which thereafter enables the telephone set to be coupled to another line, if desired, for receiving or placing another call. A conference call can be established by simultaneously operating the two or more line select switches which in turn cause the selected lines to be jointly connected to the telephone set.

US Patent:

52376117, Aug 17, 1993

Filed:

Jul 23, 1992

Appl. No.:

7/917598

Inventors:

Harry R. Rasmussen - Tacoma WA
Jack D. LaBounty - Bellevue WA
Michael J. Rosenow - Issaquah WA

Assignee:

Crest Industries, Inc. - Pacific WA

International Classification:

H04L 900

US Classification:

380 21

Abstract:

An encryption/decryption unit (EDU) that handles management of encryption keys used in the secure exchange of data over non-secure communication links. Each EDU includes a central processing unit (CPU) that controls its operation, random access memory (RAM) in which tables of key exchange keys (KEKs) are stored, and a data encryption standard (DES) coprocessor that implements a data encryption algorithm developed by the U. S. National Bureau of Standards--all comprising a module that is embedded in a potting material. Attempts to remove the potting material either by mechanical or solvent means are likely to result in loss of the data and program code stored in the module. The CPU includes special circuitry enabling it to operate in an encrypted mode so that it can not be interrogated to discover the program or data stored therein. This program enables the EDU to establish secure communications with another similar EDU over a non-secure link. Each EDU establishing a secure communications session randomly generates a portion of a session data encryption key (DEK) that is encoded by using a KEK from either a public or private table of keys stored in the embedded RAM.

US Patent:

47544767, Jun 28, 1988

Filed:

Mar 2, 1987

Appl. No.:

7/021608

Inventors:

Harry R. Rasmussen - Puyallup WA
Dan M. Percival - Maple Valley WA
Charles Nickerson - Poulsbo WA

International Classification:

H04M 342

US Classification:

379159

Abstract:

A premises in which a plurality of telephone sets (10, 12) are used is provided with dedicated intercom wiring (1, 6) having its own power source. Each telephone set (10, 12) includes standard telephone circuitry (20), for communicating off premises, and also includes an intercom circuit (21). A switch (22) is provided for switching the receiver and transmitter (HS) of each set (10, 12) between off premises communications and intercom use. Each set (10, 12) includes a paging speaker (LS1) that is a part of the intercom system. To page, a button (96) is depressed at one station and the user talks into the transmitter at that station. The transmitted message is broadcasted through the speaker (LS1) at each telephone set in the system except the one that is sending the message. The intercom system control utilizes the same wire over which the audio signal is transmitted. The paging circuitry is off when the system voltage is at a particular level and is turned on by changing the system voltage to a different level.

US Patent:

40618889, Dec 6, 1977

Filed:

Aug 12, 1976

Appl. No.:

5/713870

Inventors:

Harry R. Rasmussen - Tacoma WA

Assignee:

Crest Industries, Inc. - Puyallup WA

International Classification:

H04M 102

US Classification:

179100D

Abstract:

A control unit mounting and interconnecting apparatus for telephone desk sets is disclosed which includes a base member including a first plate portion for receiving a printed circuit board and configured to lie within and be supported by a metallic base of the telephone desk set. The base member also includes a second plate portion for supporting a control unit, such as one having a plurality of control keys, and a plurality of walls interconnecting the first plate portion and the second plate portion and defining a recess which slips over an upturned flange of the metallic base of the telephone desk set to maintain the base member in position when installed. Structure is provided in the base member for receiving a printed circuit interconnecting element, of flexible insulating material, which provides electrical interconnections between the control unit and the printed circuit board. An access aperture is provided in the second plate portion for receiving a removable access door to allow changing of bulbs used to illuminate keys of the control unit. Electrical connections to the bulbs in the control unit are provided, in part, by a flap of the printed circuit interconnecting element which can be manipulated through the access aperture.

US Patent:

42185904, Aug 19, 1980

Filed:

Jan 29, 1979

Appl. No.:

6/007202

Inventors:

Harry R. Rasmussen - Tacoma WA
Gene A. Kimzey - Puyallup WA

Assignee:

Crest Industries, Inc. - Puyallup WA

International Classification:

H04M 168

US Classification:

179 99E

Abstract:

The exclusion circuit disclosed herein provides for line privacy in a key telephone system of the type in which a control unit provided at each of a plurality of stations can be operated to selectively connect one or more telephone lines to the phone set at the corresponding station. Within each control unit, an exclusion circuit is provided for each telephone line that extends to the control unit, and is connected so as to cooperate with a line condition sensing circuit, a line switching relay, a relay latching circuit and a manually operated line selector switch, all of which are associated with the same line as the exclusion circuit. When the telephone line is in an idle condition or a hold condition, the exclusion circuit is in a nonexclusion, quiescent mode during which the manually operated selector switch is effective to switch the line relay and, in conjunction with the line condition sensing circuit, cause the relay latching circuit to latch the line relay in a condition that connects the telephone line to the station set for so long as the telephone line remains busy (in an off-hook condition). To prevent other stations from coming onto a busy line the exclusion circuits associated with the same telephone line, but located at the other stations, respond to the busy condition on the line, as detected by the associated sensing circuits, and after a predetermined delay interval such other exclusion circuits assume an exclusion mode in which the associated line selector switches are no longer effective to operate the corresponding line relays. The phone stations, other than the station that initially picks up the telephone line, are thus unable to connect the associated phone sets to the line.

US Patent:

D2732939, Apr 3, 1984

Filed:

Jun 4, 1981

Appl. No.:

6/270576

Inventors:

Harry R. Rasmussen - Tacoma WA

Assignee:

Crest Industries, Inc. - Puyallup WA

US Classification:

D14 66

US Patent:

42283248, Oct 14, 1980

Filed:

May 14, 1979

Appl. No.:

6/038830

Inventors:

Harry R. Rasmussen - Tacoma WA
Gene A. Kimzey - Puyallup WA

Assignee:

Crest Industries, Inc. - Puyallup WA

International Classification:

H04M 100

US Classification:

179 99H

Abstract:

In a key telephone system of the type that uses the tip and ring conductors of a telephone line to transmit a hold condition control signal between stations, interstation signal-generating and detecting circuitry are provided at first and second stations, respectively, for enabling the first station to actuate, during a hold condition on the line, an audible signalling device, such as a buzzer, located at the second station. The interstation signal is generated on command by selective actuation of a hold switch button at the first station, and is transmitted over the line as an altered hold control signal, which is detected at the second station. Upon such signal detection, a buzzer is energized alerting the second station to the presence of a held call on the line.

US Patent:

40557375, Oct 25, 1977

Filed:

Dec 31, 1975

Appl. No.:

5/645825

Inventors:

Harry R. Rasmussen - Tacoma WA

Assignee:

Crest Industries, Inc. - Puyallup WA

International Classification:

H01H 902

US Classification:

200 51R

Abstract:

The assembly includes a dielectric base having molded structural portions for receiving and mounting a manually operated switch, and for receiving and mounting a plurality of electrical connection terminals that serve to connect lead wires to the switch contacts. The switch contacts and electromechanical switching mechanism are mounted in a preassembled switch body, from which a plurality of substantially rigid electrical connection prongs extend. The base includes a honeycomb-like cluster of terminal receiving recesses and a plurality of prong receiving apertures, one for each recess. The prong receiving apertures extend inwardly of the base from a surface thereof defining a recess for seating the body of the switch, with each aperture opening into a separate one of the terminal receiving recesses through an interior recess sidewall. The recesses, apertures and switch prongs are cooperatively formed and disposed so that the switch prongs are insertable through the apertures to protrude into the terminal receiving recesses when the switch body is seated on the base. An electrical connection terminal means is positionable in each terminal receiving recess for mechanically gripping and electrically contacting the prong that resides therein thereby securing the switch component to the base.