Patents by Inventor Dieter W. Cardwell

Dieter W. Cardwell 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: 4932947
    Abstract: Disposable syringe apparatus is provided having a fluid cylinder and needle which is automatically retracted into a protective sleeve in the event of a release of the plunger or in the event the apparatus is accidentally dropped. The syringe apparatus is formed from an inexpensive transparent plastic and may be used for both extractions or injections as needed. A resilient member is positioned exteriorly of the fluid cylinder for ease in assembly and maintenance and acts as a means to attach the fluid cylinder to the protective sleeve.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: June 12, 1990
    Inventor: Dieter W. Cardwell