Patents by Inventor John J. Cronin

John J. Cronin 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).

  • Angular foot fin
    Patent number: 4025977
    Abstract: The following specification discloses a foot fin for propelling one through the water, having a blade surface that can be oriented within the same axis as the leg of a user. The foot fin enables one to propel oneself through the water and maintain a similar axial orientation of the driving portion of the fin, to the user's leg. In order to provide for walking while the fin is not being used in the water, a hinge point is inserted within the fin to allow it to be placed within the same general plane as the sole of a user's foot.
    Type: Grant
    Filed: September 12, 1975
    Date of Patent: May 31, 1977
    Assignee: U. S. Divers Co.
    Inventor: John J. Cronin