Patents by Inventor Harold Carl Lange

Harold Carl Lange has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for preparing foamed solids using two or more azo compounds
    Patent number: 4101464
    Abstract: Cellular polymeric solids are made by mixing an acidulous or acidic polymerizable medium that is polymerizable and/or cross-linkable by a free radical mechanism (e.g. an unsaturated polyester) with an effective amount of two or more acid sensitive mono- or poly-azo compounds containing the group: ##STR1## wherein Y is an acid sensitive group (e.g.
    Type: Grant
    Filed: September 16, 1976
    Date of Patent: July 18, 1978
    Assignee: Pennwalt Corporation
    Inventors: Ernest Rudolph Kamens, Donald Milton Kressin, Harold Carl Lange, Ronald Edward MacLeay
  • Tertiary aliphatic alpha-peroxyazo compounds
    Patent number: 4075199
    Abstract: Tertiary-aliphatic alpha-peroxyazo compounds represented by the structure ##STR1## processes for preparing these compounds by reacting ##STR2## with salts or salt solutions ofHOOH (III),(r").sub.3 cooh (iv), ##STR3## and the use of these novel compounds as polymerization initiators for vinyl monomers and as curing agents for resins. For example, 2-t-butylazo-2-(t-butylperoxy)-propane is prepared by reacting the potassium salt of t-butyl-hydroperoxide with 2-t-butylazo-2-chloropropane; and the product is used to cure unsaturated polyester resin at room temperature and to polymerize vinyl chloride at 20.degree.-30.degree. C.
    Type: Grant
    Filed: December 19, 1973
    Date of Patent: February 21, 1978
    Assignee: Pennwalt Corporation
    Inventors: Ronald Edward MacLeay, Chester Stephen Sheppard, Harold Carl Lange
  • Polymeric cellular structures
    Patent number: 4029615
    Abstract: Shaped cellular structures formed from media which are polymerizable and/or cross-linkable by free radical initiation to either a thermoplastic or thermosetting solid, process for production of such structures and the composition therefor. Process comprises preparation of composition by mixing an acid sensitive azo compound with an acidulous or acidic polymerizable medium, after which the composition is permitted to foam into a cellular structure of the desired shape.
    Type: Grant
    Filed: August 26, 1976
    Date of Patent: June 14, 1977
    Assignee: Pennwalt Corporation
    Inventors: Ernest Rudolph Kamens, Donald Milton Kressin, Harold Carl Lange, Ronald Edward MacLeay
  • .alpha.-ISOCYANATO AND .alpha.-ISOTHIOCYANATO AZOS AND THEIR DERIVATIVES
    Patent number: 4028344
    Abstract: Azoalkanes of the formula ##STR1## WHERE Z is isocyanate or isothiocyanate or derivatives thereof, such as 1-t-butylazo-1-isothiocyanatocyclohexane, which are useful as foaming agents for polyester resins and as free radical initiators for vinyl monomers.
    Type: Grant
    Filed: March 21, 1974
    Date of Patent: June 7, 1977
    Assignee: Pennwalt Corporation
    Inventors: Harold Carl Lange, Ronald Edward MacLeay
  • Process for preparing foamed structures
    Patent number: 3993609
    Abstract: Shaped cellular structures formed from media which are polmerizable and/or cross-linkable by free radical initiation to either a thermoplastic or thermosetting solid, process for production of such structures and the composition therefor. Process comprises preparation of composition by mixing an acid sensitive azo compound with an acidulous or acidic polymerizable medium, after which the composition is permitted to foam into a cellular structure of the desired shape.
    Type: Grant
    Filed: February 11, 1975
    Date of Patent: November 23, 1976
    Assignee: Pennwalt Corporation
    Inventors: Ernest Rudolph Kamens, Donald Milton Kressin, Harold Carl Lange, Ronald Edward MacLeay