William Greg Lester

US Patent:

44284136, Jan 31, 1984

Filed:

Oct 16, 1981

Appl. No.:

6/311928

Inventors:

William M. Lester - Delray Beach FL

International Classification:

B22D 1704
B22D 1730

US Classification:

164155

Abstract:

A melting pot reservoir for non-ferrous metals and the like to be die cast in a cold chamber mold is provided with a pumping mechanism having a displacement plunger for metering out by displacement from the reservoir an exact volume of molten material into the mold. This same plunger is provided with a vernier adjustment and accompanying control circuit that automatically moves the plunger an increment into the molten material after each charge the precise amount to restore the molten material level to a predetermined optimum datum level for delivery of exactly the precise amount of charge into the cold chamber.

US Patent:

58033149, Sep 8, 1998

Filed:

Jul 28, 1997

Appl. No.:

8/901717

Inventors:

William M. Lester - Delray Beach FL

International Classification:

B67D 532

US Classification:

22215314

Abstract:

A tapered valve seat and mating valve member are in fluid communication with a squeezable container interior. Fluid in the container under pressure axially displaces the valve from its seat, flows through the interface between the valve and seat and is discharged through conduits in the valve member and stem. A gradually curved undulating valve chamber ceiling wall engages a complementary curved shoulder on the valve member for limiting the axial displacement of the valve member between a locked state and a plurality of settable maximum valve interface clearances valve open states according to the relative annular positions of the shoulder to the chamber wall. The interface clearance and thus the valve maximum open position is set according to fluid viscosity to retain fluid therein to preclude ambient air passing to the container interior in response to a negative pressure in the container. This creates forces which close the valve in each relative position. A disc-like handle knob attached to the stem overlies the housing for manually rotating the valve member open and closed and for receiving indicia indicating the relative maximum clearances at the valve interface.

US Patent:

57823863, Jul 21, 1998

Filed:

Oct 2, 1996

Appl. No.:

8/720676

Inventors:

William M. Lester - Delray Beach FL

International Classification:

B67B 500

US Classification:

22215314

Abstract:

An annular tapered valve seat and mating valve on a valve member are secured in fluid communication with a container interior. Fluid in the container under pressure axially displaces the valve from its seat, flows through the interface between the valve and seat and is discharged through a transverse conduit in the valve member and an axial central conduit in the valve member stem which is sealingly engaged with a bore in the housing with annular ribs for guiding the stem. A tapered valve chamber wall engages a shoulder on the valve member for limiting the axial displacement of the valve member to retain fluid in the interface in the absence of container pressure above ambient. The fluid in the interface precludes ambient air passing to the container interior so that a negative pressure in the container results in ambient air pressure forcing the valve to its closed position. A disc-like handle knob is attached to the stem and overlies the stem and housing to form a manual grip for rotating the valve member to open and locked states formed by a ridge on the shoulder which engages the chamber wall in the locked state.