Patents by Inventor Don R. Main

Don R. Main 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).

  • Liquid pump and metering system
    Patent number: 4042149
    Abstract: A liquid pump and metering system for difficult-to-handle liquids where accurate metering and control is required. The system selectively meters the flow of liquids and employs a digital counting processor with at least one pulse deletion subsystem for correcting flow rate and total flow in accordance with environmental variables and equipment calibration requirement.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: August 16, 1977
    Assignee: Combotronics, Inc.
    Inventor: Don R. Main