Patents by Inventor David C. Bartle, Sr.

David C. Bartle, Sr. 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).

  • Method and apparatus for evacuating air from food containers
    Patent number: 4745730
    Abstract: An evacuating pump has a hollow cylindrical body, a cap at one end of the body, and a nozzle at the opposite end. A plunger disposed within the body has a piston attached to an inner end of a reciprocating rod, while the outer end of the rod extends through a bore provided in the cap. When the plunger is withdrawn, a vacuum is created at the nozzle, while on the inward stroke, a check valve flap seats over the nozzle inlet to prevent air from being injected through the nozzle. Air being compressed on the inward stroke escapes around the peripheral edge of the piston.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: May 24, 1988
    Inventor: David C. Bartle, Sr.
  • Evacuating pump
    Patent number: 4615361
    Abstract: An evacuating pump has a hollow cylindrical body, a cap at one end of the body, and a nozzle at the opposite end. A plunger disposed within the body has a piston attached to an inner end of a reciprocating rod, while the outer end of the rod extends through a bore provided in the cap. When the plunger is withdrawn, a vacuum is created at the nozzle, while on the inward stroke, a check valve flap seats over the nozzle inlet to prevent air from being injected through the nozzle. Air being compressed on the inward stroke escapes around the peripheral edge of the piston.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: October 7, 1986
    Inventor: David C. Bartle, Sr.