1
Ronald K Maxwell, Karl J Zorzi, Harunori Yoshikawa, Venkat S Prasad, Fred G Smith, Ming Chih Hsieh: High speed modem. Racal Data Communications, Arnold White & Durkee, May 8, 1990: US04924456 (52 worldwide citation)

A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing ...


2
Ronald K Maxwell: Automatic modem identification system. Racal Vadic, Lowhurst & Aine, July 29, 1980: US04215243 (44 worldwide citation)

Apparatus for communicating between a number of remote use terminals and a central computer. The apparatus initially answers an incoming call under concentrator control, and transmits an answer tone to the calling terminal. The terminal user places the modem at the terminal in data mode. The apparat ...


3
Ronald K Maxwell, Karl J Zorzi, Harunori Yoshikawa, Venkat Prasad, Fred G Smith: High speed modem. Racal Data Communications, Arnold White & Durkee, September 13, 1988: US04771417 (30 worldwide citation)

A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing ...


4
Ronald K Maxwell: Multiline automatic calling system adapter. Racal Vadic, Lowhurst & Aine, November 14, 1978: US04125872 (22 worldwide citation)

Apparatus for controlling an automatic dialer which, in response to dial digits, automatically establishes communication paths over a plurality of telephone lines. The apparatus includes interface logic connected to a computer port for receiving serial digital data from the computer. The data includ ...


5
John A C Bingham, Ronald K Maxwell: Duplex data transmission modem utilizing an injected tone for shifting power within the transmit spectrum. The Vadic Corporation, Lowhurst & Aine, July 18, 1978: US04101833 (12 worldwide citation)

A full duplex communication system including a pair of full duplex modems. Each modem has both a call originate mode of operation and a call answer mode of operation. In the call originate mode outgoing data is transmitted by modulation of a carrier frequency F2 and incoming data is received by demo ...


6
Ronald K Maxwell: Diverter valve with bellows seal. Pathway Bellows, Lane and Aitken, April 18, 1989: US04821771 (9 worldwide citation)

A diverter valve for diverting the flow of hot gases has a valve door pivotable between two outlets, each of which is surrounded by a bellows seal having a sidewall of significant width for continuous with the valve door and defining with the door a seal of large area. The sidewall is flat and unint ...


7
Ronald K Maxwell, Robert K Broyles: Damper plate sealing mechanism. Pathway Bellows, Lane and Aitken, June 7, 1988: US04749168 (7 worldwide citation)

In a sealing mechanism for a damper plate for a duct, seal members are made in the form of multi-convoluted sheet metal bellows, which engage each side of the damper plate around the periphery of the duct. When the duct is moved from an open position to a closed position, it slides between the seal ...


8
Ronald K Maxwell, David F McGrath, Gregory Allyn Perkins: Rack and pinion wheel drive for an industrial sliding blade damper. Senior Investments, Greenberg Traurig, August 19, 2008: US07413163 (3 worldwide citation)

This invention discloses improvements to a damper of the type used in industrial applications to open and close ducts carrying noxious or corrosive materials, such as combustion by-products. The improvements include a linear rack and wheeled pinion system to raise and lower a damper blade plate and ...


9
Ronald K Maxwell: Damper valve having an adjustable seat. Precision Engineered Products, Lane Aitken & McCann, February 27, 1996: US05494257 (3 worldwide citation)

A damper valve includes a base, a valve element pivotally mounted on the base and adjustable valve seat portions on opposite sides of a pivot axis, the valve seat portions being positioned on opposite sides of the blade. Each valve seat portion includes a stationary member fixed to the base, an adju ...


10
Ronald K Maxwell: Damper valve having an adjustable seat. Precision Engineered Products, John P Shannon, Venable, September 26, 2000: US06123319 (2 worldwide citation)

A damper valve includes a base, a valve blade pivotally mounted on the base and two serially arranged valve seats. Each valve seat comprises adjustable valve seat portions on opposite sides of a pivot axis of the valve blade, the valve seat portions being positioned on opposite sides of the blade. E ...