Patents by Inventor Pieter Johannes Van Der Merwe

Pieter Johannes Van Der Merwe 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).

  • Sulphur dioxide generators
    Patent number: 7045182
    Abstract: A sulphur dioxide generator (10) is disclosed which comprises two composite sheets (12, 14). First stage release of sulphur dioxide is from a coating (26) of the composite sheet (14). The coating (26) is between a paper sheet (22) and a weldable coating (24). The coating (26) incorporates a substance which, in the presence of moisture, generates sulphur dioxide. Second stage release is from sulphur dioxide generating powder which is in pockets (30). The composite sheet (12) comprises a paper layer (16) and a weldable layer (18). The layers (24, 18) are sealed together along a series of longitudinal and transverse lines to form the pockets (30).
    Type: Grant
    Filed: May 4, 2001
    Date of Patent: May 16, 2006
    Assignee: Grapetek (Proprietary) Limited
    Inventors: Dennis Charles Clemes, Petrus Johannes Van Der Westhuyzen, Pieter Johannes Van Der Merwe
  • Sulphur dioxide generators
    Publication number: 20020041939
    Abstract: A sulphur dioxide generator (10) is disclosed which comprises two composite sheets (12, 14). First stage release of sulphur dioxide is from a coating (26) of the composite sheet (14). The coating (26) is between a paper sheet (22) and a weldable coating (24). The coating (26) incorporates a substance which, in the presence of moisture, generates sulphur dioxide. Second stage release is from sulphur dioxide generating powder which is in pockets (30). The composite sheet (12) comprises a paper layer (16) and a weldable layer (18). The layers (24, 18) are sealed together along a series of longitudinal and transverse lines to form the pockets (30).
    Type: Application
    Filed: May 4, 2001
    Publication date: April 11, 2002
    Inventors: Dennis Charles Clemes, Petrus Johannes Van Der Westhuyzen, Pieter Johannes Van Der Merwe