Patents by Inventor Donald E. Howlett

Donald E. Howlett 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).

  • Syringe
    Patent number: 4024865
    Abstract: A syringe is described incorporating a hollow body, a plunger therein, and a needle extending axially from the hollow body. The force required to depress the plunger is controlled by a friction device engaging the plunger, the friction device being adjustable by a threaded friction screw mounted in the hollow body. A finger grip is mounted on the friction screw and may be turned to adjust the position of the friction screw relative to the body.
    Type: Grant
    Filed: September 16, 1975
    Date of Patent: May 24, 1977
    Assignee: Hamilton Company
    Inventor: Donald E. Howlett
  • Folding tail fins
    Patent number: 3998407
    Abstract: A rocket having flip out tail fins with cooperating surfaces on said fins d the rear of said rocket to maintain said fins in extended position. Spring means for urging said cooperating surfaces into engagement with each other.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: December 21, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ivan L. Marburger, Donald E. Howlett, Lawrence J. Nagel
  • Folding tail fins
    Patent number: 3986684
    Abstract: A rocket having flip out tail fins with cooperating surfaces on said fins d the rear of said rocket to maintain said fins in extended position. Spring means for urging said cooperating surfaces into engagement with each other.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: October 19, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ivan L. Marburger, Donald E. Howlett, Lawrence J. Nagel
  • Folding tail fins
    Patent number: 3986685
    Abstract: A rocket having flip out tail fins with cooperating surfaces on said fins d the rear of said rocket to maintain said fins in extended position. Spring means for urging said cooperating surfaces into engagement with each other.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: October 19, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ivan L. Marburger, Donald E. Howlett, Lawrence J. Nagel
  • Folding tail fins
    Patent number: 3946969
    Abstract: A rocket having flip out tail fins with cooperating surfaces on said fins d the rear of said rocket to maintain said fins in extended position. Spring means for urging said cooperating surfaces into engagement with each other.
    Type: Grant
    Filed: July 30, 1974
    Date of Patent: March 30, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ivan L. Marburger, Donald E. Howlett, Lawrence J. Nagel