Patents by Inventor Suae-Chen Chang

Suae-Chen Chang 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).

  • Patent number: 5102963
    Abstract: Polyorganophosphazenes having at least some N-(acryloxyhydrocarbyl)ureidohydrocarbyloxy groups: ##STR1## bonded to an oxygen substituted on at least some of the phosphorus atoms of the phosphazene chain. These compounds can be cross-linked by exposure to ultraviolet radiation.
    Type: Grant
    Filed: April 7, 1989
    Date of Patent: April 7, 1992
    Assignee: Ethyl Corporation
    Inventors: Charles H. Kolich, Suae-Chen Chang
  • Patent number: 5024860
    Abstract: A process for forming a low smoke, low erosion rocket motor insulation comprising mixing organic fiber selected from the group polyaramid and polybenzimidazole; an inorganic powder filler; a vulcanizable hydrocarbon elastomer and a non-fluorinated phosphazene polymer of the formula ##STR1## where Q and Q' are the same or different and are substituted or unsubstituted alkoxy or aryloxy and Q" is a group having olefinic unsaturation.
    Type: Grant
    Filed: May 24, 1989
    Date of Patent: June 18, 1991
    Assignee: Ethyl Corporation
    Inventor: Suae-Chen Chang
  • Patent number: 5001203
    Abstract: A composition comprising a polyorganophosphazene having at least some N-(acryloxyhydrocarbyl)carbamyloxyhydrocarbyloxy groups and an amount sufficient to impart cure of an aliphatic or aromatic poly acrylate ester can be cured by irradiation of the composition with ultraviolet light.
    Type: Grant
    Filed: April 11, 1988
    Date of Patent: March 19, 1991
    Assignee: Ethyl Corporation
    Inventors: Michel De Poortere, Suae-Chen Chang
  • Patent number: 4966937
    Abstract: A process for forming a low smoke, low flame spread composition comprising mixing polybenzimidazole fiber; an inorganic powder filler; and a non-fluorinated phosphazene polymer of the formula ##STR1## where x is an integer from about 20 to about 50,000, Q and Q' are the same or different and are C.sub.1 to C.sub.6 linear or branched alkoxy or substituted or unsubstituted aryloxy and Q" is a group having olefinic unsaturation; and a fluorinate phosphazene polymer of the formula ##STR2## where y is an integer from about 20 to about 50,000 Q.sub.f and Q'.sub.f are the same or different and are --OCH.sub.2 (CF.sub.2).sub.n CF.sub.3 or --OCH.sub.2 (CF.sub.2).sub.n CF.sub.2 H where n is the integer 1 to 20 and Q"' is a group having olefinic unsaturation.
    Type: Grant
    Filed: May 24, 1989
    Date of Patent: October 30, 1990
    Assignee: Ethyl Corporation
    Inventor: Suae-Chen Chang
  • Patent number: 4816532
    Abstract: Polyorganophosphazenes having at least some N-(acryloxyhydrocarbyl)carbamyloxyhydrocarbyloxy groups:H.sub.2 C.dbd.CHR--C(O)O--R--NH--C(O)O--R--O--bonded to phosphorus can be cross-linked by exposure to ultraviolet radiation.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: March 28, 1989
    Assignee: Ethyl Corporation
    Inventor: Suae-Chen Chang
  • Patent number: 4734471
    Abstract: High molecular weight non cross-linked polyfluoroalkoxyphosphazenes containing some unsaturated groups can be cured (i.e. cross-linked) by contact with a catalyst consisting essentially of platinum, a platinum halide or a haloplatinic acid or their hydrates (e.g. chloroplatinic acid hydrate).
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: March 29, 1988
    Assignee: Ethyl Corporation
    Inventor: Suae-Chen Chang
  • Patent number: 4663420
    Abstract: Polyetheroxy-substituted polyphosphazenes having reduced mono and polyetheroxy alkanol, alkali metal and halide contaminants that are suitable for use in making solid electrolytes are made by dissolving the impure polyphosphazene in an inert solvent (e.g. tetrahydrofuran) and mixing this solution with a cycloalkane (e.g. cyclohexane) to precipitate the polyetheroxy-substituted polyphosphazene with reduced etheroxy alkanol content. This can be dissolved in water and contacted with an anion exchange material to remove residual halide anions. The purified polyetheroxy-substituted polyphosphazene is then recovered by distilling off the water.
    Type: Grant
    Filed: January 21, 1986
    Date of Patent: May 5, 1987
    Assignee: Ethyl Corporation
    Inventor: Suae-Chen Chang
  • Patent number: 4656246
    Abstract: Polyetheroxy-substituted polyphosphazenes useful in making solid electrolytes are purified by dissolving the impure polyphosphazene in water at a low temperature (e.g. below 40.degree. C.) and heating the water solution to a temperature high enough to cause the purified polyphosphazene to precipitate (e.g. above 50.degree. C.).
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: April 7, 1987
    Assignee: Ethyl Corporation
    Inventors: Suae-Chen Chang, Joseph B. Tedder, Jr., J. Robert Adams, Jr.