Patents by Inventor David W. Lipp

David W. Lipp 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).

  • Polymeric sulfide mineral depressants
    Patent number: 4902764
    Abstract: A novel polymer composition comprising recurring units of the formula: ##STR1## wherein each R.sup.1 is, individually, hydrogen or C.sub.1 -C.sub.4 alkyl; each R.sup.5, individually, is hydrogen or a C.sub.1 -C.sub.4 lower alkyl group; X is OH or SH; Y is OR.sup.2, SR.sup.2, NR.sub.2.sup.2, or NR.sup.2 -NR.sub.2.sup.2 ; R.sup.2 is hydrogen, a C.sub.1 -C.sub.4 lower alkyl or a C.sub.1 -C.sub.4 substituted lower alkyl, no more than one of Y and X being hydroxyl, and M is hydrogen, an alkali metal cation or an ammonium ion; x represents a residual mole percent fraction; y is a mole percent fraction ranging from about 0.5% to about 25%; z is a mole percent fraction ranging from about 0% to about 25%; and the molecular weight of the polymer is between about 1,000 and 500,000.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: February 20, 1990
    Assignee: American Cyanamid Company
    Inventors: Alan S. Rothenberg, David W. Lipp, Samuel S. Wang, Donald P. Spitzer
  • Method of using polymeric sulfide mineral depressants
    Patent number: 4888106
    Abstract: Various acrylamide/allyl thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.
    Type: Grant
    Filed: June 8, 1989
    Date of Patent: December 19, 1989
    Assignee: American Cyanamid Company
    Inventors: David W. Lipp, D. R. Nagaraj
  • Polymeric sulfide mineral depressants
    Patent number: 4866150
    Abstract: Various acrylamide/allyl thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: September 12, 1989
    Assignee: American Cyanamid Company
    Inventors: David W. Lipp, D. R. Nagaraj
  • Polymeric sulfide mineral depressants
    Patent number: 4744893
    Abstract: A process for the froth flotation separation of value sulfide minerals from gangue iron sulfide minerals in which a novel terpolymer of copolymer of acylamide, acrylic acid and/or derivatives of acrylamide and acrylic acid is employed as a depressant for the gangue iron sulfide minerals.
    Type: Grant
    Filed: August 28, 1985
    Date of Patent: May 17, 1988
    Assignee: American Cyanamid Company
    Inventors: Alan S. Rothenberg, David W. Lipp, Samuel S. Wang, Donald P. Spitzer
  • Process for purifying alumina
    Patent number: 4717550
    Abstract: The iron content of Bayer process streams is reduced by contacting said stream with a tertiary hydroxyl-containing polyamine.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: January 5, 1988
    Assignee: American Cyanamid Company
    Inventors: Donald P. Spitzer, David W. Lipp, Alan S. Rothenberg, Hans P. Panzer
  • Stabilization of rosin dispersions with low molecular weight non-ionic polymers
    Patent number: 4328141
    Abstract: Low molecular weight, non-ionic copolymers of acrylamide and a monomer selected from the group consisting of styrene, alkyl (C.sub.4 -C.sub.24) substituted acrylamides and ethylene provide improved mechanical and heat stability to colloidal aqueous rosin dispersions.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: May 4, 1982
    Assignee: American Cyanamid Company
    Inventors: John P. Farewell, David W. Lipp
  • Electrochromic devices with polymeric electrolytes
    Patent number: 4174152
    Abstract: Improved electrochromic devices result from the incorporation of novel polymeric electrolytes. The electrolytes are based upon copolymers prepared from vinyl monomers and acid-group-containing monomers.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: November 13, 1979
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, John A. Sedlak, David W. Lipp