Patents by Inventor John H. Wagenknecht

John H. Wagenknecht 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).

  • Compositions for dissolution of soft metals
    Patent number: 5824631
    Abstract: A liquid composition useful for selective dissolution of soft metal is disclosed. The composition comprises an organic nitrocompound and a carboxylic acid. The organic nitrocompound, upon exposure to the soft metal, oxidizes the soft metal to form a first soft metal salt. The carboxylic acid, upon exposure to the soft metal salt, react with the first soft metal salt to form a second soft metal salt that is soluble in the composition. Related methods are also disclosed.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: October 20, 1998
    Inventors: John H. Wagenknecht, Gary V. Johnson
  • Method for dissolution of soft metals from a substrate of a harder metal
    Patent number: 5565039
    Abstract: A method for selectively dissolving a soft metal from a substrate of a harder metal by application thereto of an organic nitrocompound and a carboxylic acid. The organic nitrocompound, upon exposure to the soft metal, oxidizes the soft metal to form a first soft metal salt. The carboxylic acid, upon exposure to the soft metal salt, reacts with the first soft metal salt to form a second soft metal salt that is soluble in the composition.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: October 15, 1996
    Inventors: John H. Wagenknecht, Gary V. Johnson
  • Process for preparing butanetetracarboxylic acid
    Patent number: 5248396
    Abstract: 1,2,3,4-Butanetetracarboxylic acid is prepared by electrohydrodimerization of dialkyl maleates in alkanol to produce tetraalkyl butanetetracarboxylates, followed by hydrolysis of the resultant tetraalkyl butanetetracarboxylates to obtain the butanetetracarboxylic acid product.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: September 28, 1993
    Assignee: Monsanto Company
    Inventors: Eduardo A. Casanova, Dennis J. Kalota, John H. Wagenknecht
  • Process for preparing tetraalkyl butanetetracarboxylates
    Patent number: 5244546
    Abstract: The present invention is directed to a process for preparing tetraalkyl butanetetracarboxylates by electrolytic hydrodimerization of dialkyl maleates in alkanols.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: September 14, 1993
    Assignee: Monsanto Company
    Inventors: Eduardo A. Casanova, John H. Wagenknecht
  • Electronic pH and ORP indicator
    Patent number: 5218304
    Abstract: A sensor which may be immersed in a fluid to measure the pH and the ORP potential of the fluid is taught. The sensor has three solid state electrodes, a pH sensing electrode, a reference electrode and an ORP potential sensing electrode, which extend from a fluid-tight enclosure. The enclosure further contains a display means for indicating the pH measurement and the ORP potential measurement.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: June 8, 1993
    Assignee: Monsanto Company
    Inventors: Patrick J. Kinlen, John H. Wagenknecht
  • Fluid product dispenser with volume indicator
    Patent number: 5152427
    Abstract: A non-transparent, fluid product dispenser comprising a structurally rigid outer container and a flexible inner container provided with means for visually indicating the amount of product remaining in the dispenser comprising a mechanical actuator attached between the end of the liner container and an actuatable indicator on the outer container. Operating in proportion to the travel of the end of the inner container, the actuator is connected to at least one pull tab attached to an indicator window in the outer container.
    Type: Grant
    Filed: April 30, 1991
    Date of Patent: October 6, 1992
    Assignee: Monsanto Company
    Inventors: John M. Pope, James P. Coleman, John H. Wagenknecht
  • Electrochemical carboxylation of p-isobutylacetophenone and other aryl ketones
    Patent number: 4601797
    Abstract: Hydroxyibuprofen is produced in good yield by reduction of p-isobutylacetophenone at the cathode in the presence of carbon dioxide. Hydroxyibuprofen is readily hydrogenolyzed to ibuprofen. Electrochemical carboxylation of other selected aryl methyl ketones is also effected.
    Type: Grant
    Filed: March 1, 1985
    Date of Patent: July 22, 1986
    Assignee: Monsanto Company
    Inventor: John H. Wagenknecht
  • Electrochemical carboxylation of p-isobutylacetophenone
    Patent number: 4582577
    Abstract: Hydroxyibuprofen is produced in good yield by reduction of p-isobutylacetophenone at the cathode in the presence of carbon dioxide. Hydroxyibuprofen is readily hydrogenolyzed to ibuprofen.
    Type: Grant
    Filed: December 19, 1984
    Date of Patent: April 15, 1986
    Assignee: Monsanto Company
    Inventor: John H. Wagenknecht
  • Preparation of dihydroaromatic hydrocarbons
    Patent number: 4187156
    Abstract: Electrolytic reduction at the cathode of aromatic hydrocarbons in an aqueous emulsive electrolysis medium in an undivided electrolytic cell yields dihydroaromatic hydrocarbons.
    Type: Grant
    Filed: December 21, 1977
    Date of Patent: February 5, 1980
    Assignee: Monsanto Company
    Inventors: James P. Coleman, John H. Wagenknecht
  • Electrolytic flow-cell apparatus and process for effecting sequential electrochemical reaction
    Patent number: 4133726
    Abstract: This invention relates to an electrolytic flow-cell apparatus and a process for effecting sequential electrochemical reactions of redoxidative compounds at a porous working electrode. The porous working electrode has a first face and a second and opposite face, at which faces the sequential reactions are effected.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: January 9, 1979
    Assignee: Monsanto Company
    Inventors: John H. Wagenknecht, Dean G. Laurin
  • Electrolytic reductive coupling of hydroxybenzaldehydes
    Patent number: 4087336
    Abstract: Electrolytic reductive coupling of hydroxybenzaldehydes in an aqueous alkaline electrolysis medium in an undivided electrolytic cell yields 1,2-bis(hydroxyphenyl)ethane-1,2-diols.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: May 2, 1978
    Assignee: Monsanto Company
    Inventor: John H. Wagenknecht
  • Electrolytic flow-cell apparatus and process for effecting sequential electrochemical reaction
    Patent number: 4071429
    Abstract: This invention relates to an electrolytic flow-cell apparatus and a process for effecting sequential electrochemical reactions of redoxidative compounds at a porous working electrode. The porous working electrode has a first face and a second and opposite face, at which faces the sequential reactions are effected.
    Type: Grant
    Filed: December 29, 1976
    Date of Patent: January 31, 1978
    Assignee: Monsanto Company
    Inventors: John H. Wagenknecht, Dean G. Laurin
  • Process for the purification of metals
    Patent number: 4026771
    Abstract: A method and apparatus to electrochemically purify gallium is disclosed where a platinum anode is inserted into an electrolytic cell which contains the unpurified gallium as an anode and the purified gallium as a cathode, the platinum anode serving to reduce the gallium ion level in the electrolyte addition.
    Type: Grant
    Filed: October 30, 1975
    Date of Patent: May 31, 1977
    Assignee: Monsanto Company
    Inventor: John H. Wagenknecht