Patents by Inventor Lawrence Y. Yatsu

Lawrence Y. Yatsu 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).

  • Stable crystalline cellulose III polymorphs
    Patent number: 5322524
    Abstract: Novel cellulosic fiber with improved resistance to abrasion and increased permeability to chemicals characterized by highly stable crystalline cellulose III and cellulose IV forms is disclosed. Cellulose selected from either fiber, yarn, fabric, cotton, or mercerized cotton is treated with ammonia vapors at from about ambient to 140.degree. C. and from about 100 psi to 1700 psi for sufficient time to alter the interatomic planar distances and produce stable crystalline cellulose III polymorph. Crystalline cellulose III can also be immersed in ethylenediamine and then boiled in dimethylformamide to completely convert the III to cellulose IV.
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: June 21, 1994
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Lawrence Y. Yatsu, Timothy A. Calamari, Jr., Ruth R. Benerito
  • Stable crystalline cellulose III polymorphs
    Patent number: 4871370
    Abstract: Novel cellulosic fiber with improved resistance to abrasion and increased permeability to chemicals characterized by highly stable crystalline cellulose III and cellulose IV forms is disclosed. Cellulose is selected from either fiber, yarn, fabric, cotton, or mercerized cotton treated with ammonia vapors at from about ambient to 140.degree. C. and from about 100 psi to 1700 psi for sufficient time to alter the interatomic planar distances and produce stable crystalline cellulose III polymorph. Crystalline cellulose III can also be immersed in ethylenediamine and then boiled in dimethylformamide to completely convert the III to cellulose IV.
    Type: Grant
    Filed: June 18, 1987
    Date of Patent: October 3, 1989
    Assignee: The United States of America as represented by the Secretary of the Agriculture
    Inventors: Lawrence Y. Yatsu, Timothy A. Calamari, Jr., Ruth R. Benerito
  • Use of acidic hexane to process oil seeds for protein and oil
    Patent number: 3941764
    Abstract: Hexane and mixtures of hexane containing 2 to 25% acetic acid (v/v) were used to prepare oil and protein from glanded cottonseed by solvent extraction. As the amount of acetic acid in the solvent increased, the amounts of total lipid, phospholipid, neutral oil, and gossypol in each miscella increased, but the amount of free fatty acids did not change significantly. The solubility of the protein in 0.02N NaOH did not decrease until the amount of acetic acid in the solvent used to prepare each meal increased to a point between 4 and 10 percent. The drainage of the miscella (solvent-lipid solution) through the marc (insoluble residue) was much more rapid when the solvent was hexane-acetic acid than when it was hexane alone.
    Type: Grant
    Filed: May 10, 1974
    Date of Patent: March 2, 1976
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Thomas P. Hensarling, Thomas J. Jacks, Lawrence Y. Yatsu