Patents by Inventor Jan Zwagerman

Jan Zwagerman 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).

  • Constructive assembly comprising separate assembly parts
    Patent number: 4833856
    Abstract: A constructive assembly is provided comprising separate assembly parts with side-projections and corresponding side-recesses. Moreover the assembly parts comprise cooperating recesses at their top for accommodating coupling elements for holding together assembled assembly parts.
    Type: Grant
    Filed: December 15, 1987
    Date of Patent: May 30, 1989
    Inventor: Jan Zwagerman
  • Mobile crane
    Patent number: 4596336
    Abstract: According to the invention a extendible and retractable luffing jib (13) is hingedly supported by a main boom (10,25) which can be positioned in a horizontal position, which luffing jib (13) protrudes at its rear side over some distance beyond the main boom (10,25), whereby a first block of sheaves (15) is fitted on the main boom (10,25) at a lower level than the luffing jib (13) while wire ropes (19,20) are reeved between these sheaves (15) and a second block of sheaves (14) mounted on the rear end of the luffing jib (13) for luffing the luffing jib (13) as well as for hoisting.
    Type: Grant
    Filed: July 26, 1984
    Date of Patent: June 24, 1986
    Inventor: Jan Zwagerman