Ronald S Sturm

US Patent:

D2495538, Sep 19, 1978

Filed:

Aug 25, 1976

Appl. No.:

5/716751

Inventors:

Ronald Leo Sturm - San Carlos CA
James Curtis Smith - Hayward CA

Assignee:

Oxford Laboratories, Inc. - Foster City CA

International Classification:

D2402

US Classification:

D24 55

US Patent:

40967506, Jun 27, 1978

Filed:

Jun 15, 1977

Appl. No.:

5/806910

Inventors:

Ronald Leo Sturm - San Carlos CA

Assignee:

Oxford Laboratories Inc. - Foster City CA

International Classification:

B01L 302

US Classification:

734256

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.

US Patent:

40821218, Apr 4, 1978

Filed:

Aug 25, 1976

Appl. No.:

5/717745

Inventors:

Ronald Leo Sturm - San Carlos CA
James Curtis Smith - Hayward CA

Assignee:

Oxford Laboratories Inc. - Foster City CA

International Classification:

B65B 312

US Classification:

141 27

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.

US Patent:

40995488, Jul 11, 1978

Filed:

Aug 25, 1976

Appl. No.:

5/717744

Inventors:

Ronald Leo Sturm - San Carlos CA
James Curtis Smith - Hayward CA

Assignee:

Oxford Laboratories Inc. - Foster City CA

International Classification:

B65B 312

US Classification:

141 27

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.