Patents by Inventor Frank R. Haglid

Frank R. Haglid 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).

  • Thiol methylation process-reaction, recycle and regeneration of methyl bromide
    Patent number: 4435568
    Abstract: The process of thiol methylation of butylthion using methyl bromide to produce metribuzin has been significantly improved by the development of a reaction temperature profile, the recycle of methylation process reaction supernatant, and new conditions for the regeneration of methyl bromide from used methylation process reaction supernatant.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: March 6, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kenneth L. Barbour, William L. Geigle, Frank R. Haglid, deceased
  • Waste treatment process
    Patent number: 4322366
    Abstract: Processes for the treatment of toxic and malodorous wastestreams produced in the manufacture of methomyl and related compounds are provided. In these processes, methomyl and related compounds are oxidized with chlorine at a temperature of at least about 70.degree. C., preferably in the range of about 70.degree.-95.degree. C., preferably under acidic conditions, and then the resulting intermediate compounds are hydrolyzed with NaOH, KOH or Ca(OH).sub.2 at a temperature of at least about 70.degree. C., preferably in the range of about 70.degree.-100.degree. C., and at a reaction medium pH of at least about 9.5. The process is preferably carried out continuously.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: March 30, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frank R. Haglid
  • Process for preparing 1,4-dichloro-2,5-dimethoxybenzene
    Patent number: 4159391
    Abstract: P-Dimethoxybenzene is dissolved in monochlorobenzene and reacted with elemental chlorine in the presence of concentrated sulfuric acid catalyst to give 1,4-dichloro-2,5-dimethoxybenzene.
    Type: Grant
    Filed: January 25, 1978
    Date of Patent: June 26, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frank R. Haglid