Patents by Inventor Anthony D. Covington

Anthony D. Covington 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).

  • Leather tanning process using aluminium (III) and titanium (IV) complexes
    Patent number: 4937009
    Abstract: In a leather tanning process, animal skins are treated with a tanning agent comprising an aluminium (III)/titanium (IV) mixed complex with a salt of a polyhydroxymonocarboxylic acid as a masking compound. The masking compound preferably has the general formula:HOCH.sub.2 (CHOH)n CO.sub.2 Mwherein M is an alkali metal, and n is 2 to 6. Especially preferred masking compounds are sodium gluconate and sodium glucoheptonate. The same process can be used for a wide range of skins, both as a base tannage and in combination with other tanning processes.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: June 26, 1990
    Assignee: Tioxide Group PLC
    Inventor: Anthony D. Covington
  • Leather tanning process using aluminium (III) and titanium (IV) complexes
    Patent number: 4731089
    Abstract: In a leather tanning process, animal skins are treated with a tanning agent comprising an aluminium (III)/titanium (IV) mixed complex with a salt of a polyhydroxymonocarboxylic acid as a masking compound. The masking compound preferably has the general formula:HOCH.sub.2 (CHOH)n CO.sub.2 Mwherein M is an alkali metal, and n is 2 to 6. Especially preferred masking compounds are sodium gluconate and sodium glucoheptonate. The same process can be used for a wide range of skins, both as a base tannage and in combination with other tanning processes.
    Type: Grant
    Filed: October 16, 1985
    Date of Patent: March 15, 1988
    Assignee: Tioxide Group PLC
    Inventor: Anthony D. Covington