Patents by Inventor Hans-Hermann Dietrichs

Hans-Hermann Dietrichs 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 production of xylitol from lignocellulosic raw materials
    Patent number: 4742814
    Abstract: A process for the production of sugars, and optionally cellulose and lignin, from lignocellulosic vegetable materials which comprises subjecting the vegetable materials to a chemical pretreatment with a mixture of water and lower aliphatic alcohols and/or ketones at a temperature from 100.degree. to 190.degree. C. for a period of from 4 hours to 2 minutes with control of the breakdown of the hemicellulose components followed by separation of residue and a subsequent main chemical treatment with a similar solvent mixture at elevated temperatures for a further period of from 6 hours to 2 minutes.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: May 10, 1988
    Assignee: Bau- und Forschungsgesellschaft Thermoform AG
    Inventors: Michael Sinner, Hans-Hermann Dietrichs, Jurgen Puls, Werner Schweers, Karl-Heinz Brachthauser
  • Aqueous heat-curable compositions, and their use
    Patent number: 4587285
    Abstract: Aqueous heat-curable compositions which are based on known heat-curable condensation products of aldehydes and OH- and/or NH.sub.2 -containing compounds, which contain hemicellulose-cleavage products having an average degree of polymerization, DP, of 5 to 100 and of at least 10% by weight, relative to the total weight of heat-curable materials, and aldehydes, in an amount of 5 to 50% by weight, relative to the weight of hemicellulose-cleavage products. The invention also relates to the use of these compositions for glueing and for preparing moldings.
    Type: Grant
    Filed: April 7, 1983
    Date of Patent: May 6, 1986
    Assignee: Fritz-Werner Industrie-Ausruestungen GmbH
    Inventors: Cihan Ayla, Hans-Hermann Dietrichs, deceased, Jurgen Puls, Michael Sinner
  • Process for production of sugars and optionally cellulose and lignin from lignocellulosic raw materials
    Patent number: 4520105
    Abstract: A process for the production of sugars, and optionally cellulose and lignin, from lignocellulosic vegetable materials which comprises subjecting the vegetable materials to a chemical pretreatment with a mixture of water and lower aliphatic alcohols and/or ketones at a temperature from 100.degree. to 190.degree. C. for a period of from 4 hours to 2 minutes with control of the breakdown of the hemicellulose components followed by separation of residue and a subsequent main chemical treatment with a similar solvent mixture at elevated temperatures for a further period of from 6 hours to 2 minutes.
    Type: Grant
    Filed: August 10, 1983
    Date of Patent: May 28, 1985
    Assignee: Bau- und Forschungsgesellschaft Thermoform AG
    Inventors: Michael Sinner, Hans-Hermann Dietrichs, Jurgen Puls, Werner Schweers, Karl-Heinz Brachthauser
  • Process for the production of xylose by enzymatic hydrolysis of xylan
    Patent number: 4275159
    Abstract: A process for the production of xylose by enzymatic hydrolysis of xylan wherein an aqueous solution containing xylan is treated with a carrier having bonded thereto xylanase enzyme and a carrier having bonded thereto .beta.-xylosidase and, optionally, uronic acid-splitting enzyme.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: June 23, 1981
    Assignee: Projektierung Chemische Verfahrenstechnik GmbH
    Inventors: Jurgen Puls, Michael Sinner, Hans-Hermann Dietrichs
  • Process for the production of xylose by enzymatic hydrolysis of xylan
    Patent number: 4200692
    Abstract: A process for the production of xylose by enzymatic hydrolysis of xylan wherein an aqueous solution containing xylan is treated with a carrier having bonded thereto xylanase enzyme and a carrier having bonded thereto .beta.-xylosidase and, optionally, uronic acid-splitting enzyme.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: April 29, 1980
    Assignee: Projektierung Chemische Verfahrenstechnik GmbH
    Inventors: Jurgen Puls, Michael Sinner, Hans-Hermann Dietrichs
  • Process for obtaining xylan and fibrin from vegetable raw material containing xylan
    Patent number: 4181796
    Abstract: A process for the production of xylan and fibrinous material from vegetable raw material by treating the raw material with saturated steam at a temperature of from 160.degree. to 230.degree. C. for a period from 2 minutes to 4 hours.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: January 1, 1980
    Assignee: Projektierung Chemische Verfahrenstechnik Gesellschaft mit beschrankter Haftung
    Inventors: Hans-Hermann Dietrichs, Michael Sinner, Fritz Opderbeck, Karl-Heinz Brachthauser
  • Process for the production of glucose from cellulose-containing vegetable raw materials
    Patent number: 4160695
    Abstract: A process for the production of glucose from cellulose containing raw material by steam treatment at a temperature from 160.degree. to 230.degree. C. for from 2 minutes to 4 hours followed by lixiviation with aqueous alkali and acid or enzymatic hydrolysis of fibrinous residue.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: July 10, 1979
    Assignee: Projektierung Chemische Verfahrenstechnik Gesellschaft mit beschrankter Haftung
    Inventors: Hans-Hermann Dietrichs, Michael Sinner, Fritz Opderbek, Karl-Heinz Brachthauser