Patents by Inventor Ralph Carlysle Evans

Ralph Carlysle 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).

  • Patent number: 3997999
    Abstract: A mosquito trap consisting of a receptacle containing water and having two chambers separated by a screen member. The first chamber is open to the atmosphere while the second chamber is enclosed and contains a food retaining member remote from the first chamber. The mosquito trap permits a female mosquito to lay its eggs in the water of the first chamber. The ensuing larvae will swim through the screen member to the second chamber in quest for the food. Upon growing larger and transforming into a pupa stage and then into a young adult mosquito, they become trapped to die in the second chamber as the screen openings are not of such size to permit the larvae, pupae or mosquitoes to escape back into the first open chamber.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: December 21, 1976
    Inventor: Ralph Carlysle Evans