Patents by Inventor Ronald Leo Sturm

Ronald Leo Sturm 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: 4099548
    Abstract: A hand-held pipette with a liquid dispensing knob at one end operably connected therewithin to a piston and piston cylinder assembly at the opposite end that is detachable from the pipette body for cleaning or replacement. An internal pawl and rack mechanism causes the piston to advance a small amount each time the knob is pressed, thereby repetitively dispensing small volumes of liquid therefrom. A second knob cooperatively engages an internal mechanism for both urging the piston to an overshoot position within the piston chamber and to disengage the piston from the internal mechanism in the pipette housing.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: July 11, 1978
    Assignee: Oxford Laboratories Inc.
    Inventors: Ronald Leo Sturm, James Curtis Smith
  • Patent number: 4096750
    Abstract: A micropipettor having an adjustable stop threadedly engaged with an internal reciprocal plunger assembly for defining the stroke length of the plunger and thus of a fluid displacing piston that is attached to the plunger assembly. The adjustable stop is manipulated by operable connection with a volume adjustment knob provided on the outside of the micropipettor body. The plunger carries a coarse volume indicating scale and the volume adjustment knob is provided with a fine volume setting scale. Accidental changes in volume adjustments are avoided by two types of automatic locks: a frictional engagement of the internal volume adjustment mechanism unless the plunger is deliberately placed in a certain position by the operator, and a detent lock of the volume adjustment knob unless the operator deliberately depresses it.
    Type: Grant
    Filed: June 15, 1977
    Date of Patent: June 27, 1978
    Assignee: Oxford Laboratories Inc.
    Inventor: Ronald Leo Sturm
  • Patent number: 4082121
    Abstract: A hand-held liquid dispenser of the type using a piston and piston cylinder for precise dispensing of desired volumes of liquid, including an improvement that automatically eliminates any air from the piston cylinder when an operator normally fills the piston cylinder with the desired liquid. A second piston of larger diameter than the first is disposed to draw fluid through the piston chamber at a much faster rate during a first short segment of an intake stroke than would the first piston, thereby to exhaust all dead air from the cylinder and fill it entirely with liquid.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: April 4, 1978
    Assignee: Oxford Laboratories Inc.
    Inventors: Ronald Leo Sturm, James Curtis Smith
  • Patent number: D249553
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: September 19, 1978
    Assignee: Oxford Laboratories, Inc.
    Inventors: Ronald Leo Sturm, James Curtis Smith