1
Richard D Williams: Positive drive differential. Warn, Graybeal Barnard Uhlir & Hughes, February 3, 1976: US03935753 (25 worldwide citation)

A positive drive differential to drive either or both of a pair of co-axially mounted axle-driving hubs, and to permit free overrun of either hub. There are two sets of roller clutch elements between the two hubs and the drive casing, and these are positioned in two cages having inwardly extending r ...


2
Richard D Williams: Power transmission for a vehicle. Warn, Graybeal Barnard Uhlir & Hughes, March 2, 1976: US03941199 (22 worldwide citation)

A power transmission capable of transmitting power to both the front and rear sets of wheels of a vehicle, and also to automatically selectively transmit power to the slower rotating set of front or rear wheels. The transmission comprises an inner driving hub which acts through two interconnected se ...


3
Donald G Erickson, Joseph P Deschamps, Lindell R Flynn, John A Burns, Richard D Williams: Lawn and garden tractor hydrostatic foot control system. Murray, Cushman Darby & Cushman, April 23, 1996: US05509496 (21 worldwide citation)

A mechanism for controlling the direction and speed of an off-road vehicle having a frame, an operator seat, a steering wheel, an engine and a variable speed transmission coupled for driving at least one of a plurality of ground wheels. The mechanism comprises a floor plate carried by the vehicle fo ...


4
Richard D Williams, Lacey C Coffey: Portable drill string compensator. Control Flow, Andrews Kurth, Anthony F Matheny, November 29, 2005: US06968900 (15 worldwide citation)

A closed system drill string compensator having a hydraulic fluid accumulator, at least one air pressure vessel, and a piston and a piston rod slidably engaged within a cylinder. The drill string compensator provides tensioning force for supporting a drill string and permits the drilling vessel to r ...


5
Desmond T Curran, Peter D Lee, Richard D Williams, Peter N Yates, Derek S Baker: Supplied air helmet having face seal with differentiated permeability. 3M Innovative Properties Company, Karl G Hanson, April 3, 2007: US07197774 (15 worldwide citation)

A supplied air helmet 10 comprises a visor 14 and a face seal 12 that is secured to the visor. The face seal 12 includes a sealing member 18 and a frame member 16. The sealing member 18 extends radially inward from the frame member 16 and has first and second regions of permeability 20 and 22. The s ...


6
Richard D Williams, Lacey C Coffey: Ram-type tensioner assembly having integral hydraulic fluid accumulator. Control Flow, Andrews Kurth, Anthony F Matheny, March 7, 2006: US07008340 (14 worldwide citation)

The invention is directed to a tensioner assembly for providing tensile force from a floating vessel at the surface of the ocean to the blowout preventer stack, or production tree, which is connected to the wellhead at the sea floor. The tensioner assembly compensates for vessel motion induced by wa ...


7
Richard D Williams, Lacey C Coffey: Portable drill string compensator. Control Flow, Bracewell & Giuliani, Anthony F Matheny, November 7, 2006: US07131496 (12 worldwide citation)

A closed system drill string compensator having a hydraulic fluid accumulator, at least one air pressure vessel, and a piston and a piston rod slidably engaged within a cylinder. The drill string compensator provides tensioning force for supporting a drill string and permits the drilling vessel to r ...


8
Richard D Williams, Lacey C Coffey: Ram-type tensioner assembly having integral hydraulic fluid accumulator. Control Flow, Bracewell & Giuliani, Anthony F Matheny, November 7, 2006: US07131922 (10 worldwide citation)

The invention is directed to a tensioner assembly for providing tensile force from a floating vessel at the surface of the ocean to the blowout preventer stack, or production tree, which is connected to the wellhead at the sea floor. The tensioner assembly compensates for vessel motion induced by wa ...


9
Richard D Williams: Construction material. Robert L Harrington, July 21, 1987: US04680907 (7 worldwide citation)

A building material for cement based facing such as stucco and brick facing. A thin layer of water impervious epoxy is applied to one side of a wallboard or plywood sheeting. Sand is imbedded in the epoxy in a manner to fully cover the epoxy. The sand surface provides a compatible bonding surface fo ...


10
Richard D Williams: Hydraulically cushioned pressure relief value. Retsco, Jenkens & Gilchrist P C, February 10, 1998: US05715861 (7 worldwide citation)

A pressure relief valve has a moveable piston disposed in a body between inlet and outlet ports in the body. A volumetrically variable enclosed chamber is formed within the body with a portion of the chamber being defined by an upper surface of the piston. At least one aperture extends through the h ...