Patents by Inventor James K. Bidwell

James K. Bidwell 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).

  • One-time use hypodermic syringe apparatus and operation thereof
    Patent number: 5328476
    Abstract: A hypodermic syringe apparatus having a plunger with first and second sets of grooves, and a casing having first and second lock members, such that when the plunger is fully inserted or reinserted into the casing, the plunger is prevented from being withdrawn relative to the casing. The first and second sets of grooves of the plunger have stepped portions, such that the plunger can be withdrawn relative to the casing when the plunger is positioned (position A) in such a way that the first set of grooves interacts with the first lock member of the casing; and such that the plunger can be inserted or reinserted into the casing when the plunger is positioned (position B) in such a way that the second set of grooves interacts with the second lock member of the casing.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: July 12, 1994
    Inventor: James K. Bidwell