Patents by Inventor Eugene J. Gratz

Eugene J. Gratz 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).

  • Injection molded propeller
    Patent number: 4477228
    Abstract: An inexpensive injection molded propeller for mounting on a drive shaft. The drive shaft is attached to the hub of the propeller by a chemical and thermal shrink fit and by deformation due to the rotational forces of the propeller thereby producing a positive locking hub on the drive shaft. The propeller may be used, not only for remote piloted missiles and aircraft, but can also be used with different types of boat inboard and outboard drives, vehicles and equipment requiring a propeller having a positive locking system for securing the propeller or the like to the drive shaft.
    Type: Grant
    Filed: January 28, 1982
    Date of Patent: October 16, 1984
    Assignee: The Boeing Company
    Inventors: Brian J. Duffy, Eugene J. Gratz, Steven E. Potter, Royal A. Power
  • Method of making an injection molded propeller
    Patent number: 4414171
    Abstract: A method of making an inexpensive injection molded propeller for mounting on a drive shaft. The drive shaft is attached to the hub of the propeller by a chemical and thermal shrink fit and by deformation due to the rotational forces of the propeller thereby producing a positive locking hub on the drive shaft. The propeller may be used, not only for remote piloted missiles and aircraft, but can also be used with different types of boat inboard and outboard drives, vehicles and equipment requiring a propeller having a positive locking system for securing the propeller or the like to the drive shaft.
    Type: Grant
    Filed: January 28, 1982
    Date of Patent: November 8, 1983
    Assignee: The Boeing Co.
    Inventors: Brian J. Duffy, Eugene J. Gratz, Steven E. Potter, Royal A. Power