Patents by Inventor Leonard J. Maasdam

Leonard J. Maasdam 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: 4723629
    Abstract: An extension ladder includes outwardly facing auxiliary rail channels at the lower end on each of the side rails which nestingly engage inwardly facing channels on auxiliary legs extending at an angle to the plane of the ladder for supporting the ladder on irregular terrain in a stable manner. The leg assemblies are selectively positioned independently of each other and locked in a desired position by spring-loaded fingers carried on the leg assembly channels which engage teeth on the ladder rail channels. An extension leg for either of the ladder rails is provided which nestingly engages the ladder rail channel and is locked in place by a spring-loaded finger engaging the teeth on the rail channel.
    Type: Grant
    Filed: February 13, 1987
    Date of Patent: February 9, 1988
    Assignee: Vernon M. Vanden Hoek
    Inventors: Vernon M. Vanden Hoek, Leonard J. Maasdam