Patents by Inventor Henry G. Heinsohn

Henry G. Heinsohn 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).

  • Patent number: 5801034
    Abstract: This invention provides a method for killing cells in fermentation mixtures in order to prepare the fermentation mixture for processing to recover or extract a desired product from the fermentation mixture. A preferred method of this invention comprises in either order, adjusting the pH of the fermentation mixture to a value equal to or less than about two pH units below the pK.sub.a of the compatible organic acid using a mineral acid, and adding a sufficient amount of a compatible organic acid and/or organic acid salt to the mixture to effect a substantially complete cell kill. The method of this invention is useful for killing microorganisms such as yeast, bacteria or fungi in any culture or fermentation mixture and is particularly useful in systems where it is desired to kill the cells without lysing them.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: September 1, 1998
    Assignee: Genencor International
    Inventors: Virgil B. Lawlis, Jr., Henry G. Heinsohn, Enrique F. Baliu
  • Patent number: 5378621
    Abstract: This invention provides a method for killing fungal cells without lysing in fermentation processes in order to prepare the fermentation mixture for processing to recover or extract an extracellularly expressed enzyme from the fermentation mixture. A preferred method of this invention comprises adjusting the pH of the fermentation mixture to less than 2.79 using a mineral acid, then adding sufficient acetic acid to the mixture to affect a substantially complete cell kill in mixture. A salt of the acetic acid can be used. The organic acid or salt can be added, then the pH adjusted to the desired level. Other organic acids can be used, in which case the pH of the mixture is adjusted to the pK.sub.a of the selected organic acid before the organic acid is added to the mixture.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: January 3, 1995
    Assignee: Genencor, Inc.
    Inventors: Virgil B. Lawlis, Jr., Henry G. Heinsohn, Enrique F. Baliu
  • Patent number: 5215908
    Abstract: This invention provides a method of recovering and purifying chymosin from fermentation used for microbial production of chymosin. The fermentation mixture is filtered to provide a filtrate containing the chymosin. The filtrate is first prepared by either adjusting it to a low pH, such as about 2 and/or adjusting the salt concentration of the filtrate to at least about 2M. The aqueous filtrate mixture is contacted with a phenyl-sepharose resin, which selectively binds the chymosin from the filtrate. The filtrate remaining after the contact with the phenyl-sepharose resin is discarded, and the phenyl-sepharose resin column is eluted with water or dilute salt solution to obtain substantially pure chymosin in a single elution step.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: June 1, 1993
    Assignee: Genencor International, Inc.
    Inventors: Henry G. Heinsohn, Matthew B. Murphy
  • Patent number: 5151358
    Abstract: Disclosed are methods for the recovery and purification of naturally produced chymosin. In particular, disclosed are methods for the recovery and purification of chymosin from aqueous solutions containing chymosin, pepsin and other contaminants.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: September 29, 1992
    Assignee: Genencor International, Inc.
    Inventors: Henry G. Heinsohn, Jeffrey D. Lorch, Kirk J. Hayenga, Raymond E. Arnold
  • Patent number: 5139943
    Abstract: Disclosed are methods for the recovery of microbially produced chymosin. In particular, disclosed are methods for the recovery of chymosin from the fermentation beer arising from culturing microorganisms which have been engineered so as to produce chymosin. Also disclosed are methods for the selective recovery and subsequent purification of microbially produced chymosin.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: August 18, 1992
    Assignee: Genencor International, Inc.
    Inventors: Henry G. Heinsohn, Jeffrey D. Lorch, Kirk J. Hayenga, Raymond E. Arnold