Patents by Inventor Alvin M. Robbins

Alvin M. Robbins 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).

  • Method of making variable pleat paper
    Patent number: 4181070
    Abstract: A variable pleat filter paper pleater with rotary scoring means is disclosed. A large roll of resin impregnated paper is passed through rotary scoring means to score the paper to facilitate folding (pleating). The paper is drawn past or through the rotary scoring means by drive rollers. The rotary scoring means rotational speed may be varied with respect to the drive rolls. The scored paper passes from the drive rolls into pleating means which causes the paper to form pleats. The pleated paper is passed through an oven to cure the paper. The cured or partially cured paper is placed in porous canisters. Lids are sealed on each end of the canister to form an air filter for vehicles.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: January 1, 1980
    Inventors: Alvin M. Robbins, Paul J. Robbins