Patents by Inventor Leonard L. Manning

Leonard L. Manning 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: 5033943
    Abstract: A pump (20) has a housing (22) consisting of top (24), bottom (26), sides (28) and (30) and ends (32), (34), and (36) defining a plenum (38). An axially extending passage (40) is formed by the ends (32) and (34), through which flexible tubing (42) passes. The plenum (38) is connected to the passage (40). A pressure block (44) is slideably positioned in the plenum (38) for movement toward and away from the flexible tubing (42). The pressure block (44) has a rectangular opening (46), which receives a circular bearing (48) and a circular cam (50) which is eccentrically mounted on shaft (52). Conventional ball valves (54) and (56) are provided in the flexible tubing (42) above and below the pressure block (44). The lifetime of the tubing is substantially enhanced if the pressure block (24) depresses the tubing (42 ) no more than half of its inside diameter. When this limitation is followed, no creasing or similar localized severe distortion of the tubing (42) takes place.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: July 23, 1991
    Assignee: Eldex Laboratories, Inc.
    Inventors: Emmett L. Durrum, Leonard L. Manning