Patents by Inventor Mark I. Evans

Mark I. Evans 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).

  • Needle assembly with a movable stylet controlled by a spacer mechanism
    Patent number: 5279570
    Abstract: A needle assembly which comprises a hollow needle, a stylet, and a spacer mechanism to control the position of the stylet within the needle.
    Type: Grant
    Filed: September 22, 1992
    Date of Patent: January 18, 1994
    Assignee: Wayne State University
    Inventors: Mitchell P. Dombrowski, Mark I. Evans
  • Contraceptive and prophylactic device
    Patent number: 4945923
    Abstract: A contraceptive device adapted to be worn by a female, and which serves to prevent the exchange of body fluids during intercourse, is disclosed. A preferred embodiment of the device has an elongate tubular sheath formed of thin, fluid impermeable material, the sheath having a closed inner end portion and an open outer end portion. A resilient inner ring is connected to the inner end portion for anchoring the same to the cervix of a wearer. An outer ring is connected to the open outer end portion for maintaining the outer end portion in an open configuration.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: August 7, 1990
    Inventors: Mark I. Evans, Frederick C. Greenwood