Patents by Inventor Alan P. Leonard

Alan P. Leonard 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 forming copolymer particles
    Patent number: 4547329
    Abstract: Disclosed is a process for the formation of olefin-vinyl alcohol copolymer pellets which comprises mixing particles of the copolymer with water to obtain a wet cake containing about 20-70% solids by weight to thereby obtain a plasticized mass of the copolymer, thereafter extruding the copolymer at a temperature of about 5.degree.-7.degree. C. below the melting point of the mass through a nozzle to form a rod, and dividing the rod into individual pellets.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: October 15, 1985
    Assignee: Eastman Kodak Company
    Inventors: John R. Dombroski, J. Maynard Hawkins, Mark A. Pollock, Alan P. Leonard, Thomas A. Mitchell
  • Process for esterification of cellulose using as the catalyst the combination of sulfuric acid, phosphoric acid and a hindered aliphatic alcohol
    Patent number: 4480090
    Abstract: The present invention relates to a method of preparing lower fatty acid esters of cellulose which comprises esterifying at a temperature of between about 75.degree. C. and about 110.degree. C. a cellulose compound having esterifiable hydroxyl groups with an esterifying bath comprising an organic acid anhydride, a diluent, and a catalyst comprising from 0.2 to 2.0 parts phosphoric acid, from 0.1 to 1.2 parts sulfuric acid, and from 0.05 to 0.6 parts of a hindered aliphatic alcohol by weight per 100 parts of the cellulose to be esterified.
    Type: Grant
    Filed: October 21, 1983
    Date of Patent: October 30, 1984
    Assignee: Eastman Kodak Company
    Inventors: Chung-Ming Kuo, Alan P. Leonard