1
Cecil R Gilbreath: High-resolution laser plotter. Geosource, Arnold White & Durkee, March 17, 1981: US04257053 (45 worldwide citation)

A high-resolution laser graphics plotter for plotting data on a recording medium as selectively positioned spots (pixels) of variable intensity is disclosed. The intensity of a collimated laser beam is modulated in response to plotting data to produce a modulated light beam. The modulated light beam ...


2
John M Coogler: Tapered geophone spring. Geosource, Arnold White & Durkee, July 3, 1984: US04458344 (38 worldwide citation)

A geophone spring is disclosed in which an inner ring member and an outer ring member are connected by a plurality of leg members. Each leg member includes a tapered segment that is wider at its middle than it is at either end. The tapered segment is connected to the inner ring by an inner segment, ...


3
Twassul A Kahn, John W Kiowski, Douglas G Lang: Method and apparatus for obtaining a composite field response _to a variable source array using weighting coefficients. Geosource, Arnold White & Durkee, June 30, 1981: US04276620 (36 worldwide citation)

A multi-channeled digital seismic field stacking system is disclosed for obtaining the composite response to a variable source array. A variable source array is synthesized by applying preselected weighting coefficients to the seismic signals produced in response to a selected number of surface ener ...


4
Michael C Hoover, Charles R Brazell, Shyam B Mehta, James F Lockett, Elias H Codding: Roll sorting apparatus. Geosource, Arnold White & Durkee, January 5, 1982: US04308959 (35 worldwide citation)

An apparatus for sorting articles based upon the presence of defects on the surface thereof is characterized by a roller conveyor carrying a random array of articles in transverse channels defined between adjacent rollers. As the conveyor is advanced through a viewed area the articles are simultaneo ...


5
Roger W Day: Centrifugal mud mixer. Geosource, January 22, 1980: US04184771 (34 worldwide citation)

An apparatus and method for mixing liquid or drilling mud with solids is disclosed. The apparatus provides first and second concentric housings which are utilized as mixing chambers. An inlet passageway is tangentially connected to the inner housing for feeding a slurry material to be mixed with sol ...


6
Michael C Hoover, Elias H Codding: Color sorting apparatus. Geosource, Arnold White & Durkee, September 14, 1976: US03980181 (28 worldwide citation)

Apparatus for sorting a random stream of articles moving along a wide path in a product flow according to their color. When an article having an unacceptable color is detected, a signal is generated to activate an ejector to remove the unacceptable article from the product flow. Apparatus according ...


7
Hagedoorn Laurens Arend, Vitringa Frederick Anton: Geophone spring.. Geosource, June 11, 1986: EP0184231-A2 (27 worldwide citation)

A geophone spring system for suspending a reference mass which comprises first means (2,3,5) for centering the reference mass both laterally and along its axis and second means (4,7) for centering the reference mass laterally and for providing a heavily damped compliance in a radial direction to pre ...


8
Frederick A Vitringa: Delta-shaped geophone spring. Geosource, Arnold White & Durkee, November 18, 1986: US04623991 (26 worldwide citation)

For use in geophones to support either the coil or the permanent magnet, a spring formed from a disc, said spring having an outer ring, an inner ring, and three legs connecting the outer and inner rings. The legs are equidistant from one another and substantially equal in length. The inner edge of e ...


9
Roger W Day, Charles N Grichar: High capacity continuous solid bowl centrifuge. Geosource, Arnold White & Durkee, May 10, 1988: US04743226 (23 worldwide citation)

A high capacity continuous solid bowl centrifuge is disclosed having longitudinal vanes which cooperate with helical flights to form longitudinal channels. The longitudinal vanes may be curved vanes or they may be planar vanes disposed either radially or at an acute angle relative to a radius from t ...


10
John M Coogler: Geophone spring. Geosource, Arnold White & Durkee, April 6, 1982: US04323994 (22 worldwide citation)

A new geophone spring is disclosed wherein the outer and inner rings of the spring are connected by leg members having a substantially straight segment which will pivot about an outer portion of the leg in a manner which will reduce the lateral bending forces acting upon the spring legs and increase ...