Allen C Ludwig

42908167, Sep 22, 1981

Jan 29, 1979

6/007042

Allen C. Ludwig - San Antonio TX
John M. Dale - San Antonio TX
Henry F. Frazier - San Antonio TX

Southwest Research Institute - San Antonio TX

C09K 300

10628732

Elemental sulfur is reacted in a certain manner with at least first and second hydrocarbons to form an asphalt-like material.

RE315753, May 1, 1984

May 6, 1983

6/492183

Allen C. Ludwig - San Antonio TX
John M. Dale - San Antonio TX
Henry F. Frazier - San Antonio TX

Southwest Research Institute - San Antonio TX

C09K 300
C08L10100

10628732

Elemental sulfur is reacted in a certain manner with at least first and second hydrocarbons to form an asphalt-like material.

50890522, Feb 18, 1992

Aug 10, 1989

7/392105

Allen C. Ludwig - San Antonio TX

C08L 9500

106276

A method for emulsification of rock asphalt, the resulting low asphalt emulsion and low asphalt emulsion binder for aggregate is disclosed. Fine mesh rock asphalt is emulsified by using a hydrocarbon fluxing agent to sufficiently wet the rock asphalt to produce a fluid mixture, followed by addition of water, small amounts of surfactant and salts, heating the fluid mix while the mixture is being gently stirred. The rock asphalt emulsion can be formed from rock asphalts having low asphalt content, as low as 5, 6, or 7% by weight and greater. Depending on the rock asphalt ore source, the emulsion is comprised of varying amounts of hydrocarbon fluxing oils which are present in sufficient volume to form a fluid mix, from less than about 25% to greater than matching parts by volume of water, and lesser amounts of surfactants and salts. These emulsions have been found to be effective as binders for limestone aggregate coatings, seal, coats, pliable mats and other surprising applications.

52640035, Nov 23, 1993

Feb 12, 1992

7/834610

Jon Ross - San Antonio TX
Allen C. Ludwig - San Antonio TX

C10L 700

44266

A stable gelled material used as a fuel which consists of a composition of diethylene glycol mixed with a gelling agent of fumed silica. Polyethylene glycol may also be added to improve its burning characteristics.

40228576, May 10, 1977

Feb 24, 1975

5/552012

John M. Dale - San Antonio TX
Allen C. Ludwig - San Antonio TX

Chevron Research Company - San Francisco CA

C04B 3304
B29H 720

264 42

Sulfur-based foams are produced by heating to liquid state a sulfur formulation containing a minor amount of a gas-producing component in a first (molten) zone; passing the mixture maintained in liquid form to a second (mixing) zone where it is mixed with a foaming agent which in combination with the gas-produced compound releases gas, and the gas-containing mixture is passed from the second zone for use as a cellular construction material. Apparatus for carrying out the process is provided.

44759533, Oct 9, 1984

Feb 24, 1983

6/469216

Allen C. Ludwig - San Antonio TX
Larry W. Wolter - San Antonio TX
Henry F. Frazier - San Antonio TX

Southwest Research Institute - San Antonio TX

C09K 300

10628724

The invention relates to an emulsion and a method of making same based on adding water to a sulfur reaction product, the latter being prepared by reacting certain first and second hydrocarbons with elemental sulfur.

40111792, Mar 8, 1977

Feb 7, 1975

5/548061

Gar Lok Woo - Tiburon CA
John M. Dale - San Antonio TX
Allen C. Ludwig - San Antonio TX

Chevron Research Company - San Francisco CA

C08J 900

260 25A

A process for the production of sulfur foam containing at least 50 weight percent sulfur, which comprises: A. heating sulfur in a first zone to a temperature above about 100. degree. C to obtain molten sulfur and reacting the molten sulfur with an organic protonic acid which is reactive with molten sulfur so as to incorporate the organic acid with sulfur to form a sulfur-organic acid adduct containing unreacted protonic acid groups; B. passing said sulfur adduct in liquid state out of said first zone and into a separate mixer; and C. mixing and reacting in said mixer a polyisocyanate with the unreacted acid groups of said sulfur adduct to thereby, upon removal of the polyisocyanate-acid group reaction product from the mixer, release gas and generate a foam. Preferably the sulfur adduct is formed by reacting sulfur with a plasticizer as well as the acid. The plasticization resulting from phenol reacting with sulfur is particularly preferred, and preferably the liquid phenolmodified sulfur-acid adduct is reacted with polyisocyanate in the mixer within a residence time of 0. 1 to 3.