David W Ho

US Patent:

61003107, Aug 8, 2000

Filed:

Sep 25, 1998

Appl. No.:

9/160968

Inventors:

David J. Ho - Berwyn PA

Assignee:

Bayer Antwerp N.V. - Antwerp

International Classification:

C08G 1804

US Classification:

521159

Abstract:

Microcellular elastomers and a process for making them are disclosed. The process comprises reacting a resin component ("B" side) with an isocyanate-terminated prepolymer ("A" side). Pre-reacting the right proportion of chain extender into an "A" side that also includes a high-primary, low-unsaturation polyol is the key to making low-density (less than 0. 5 g/cm. sup. 3) microcellular elastomers while avoiding problems with poor processing or inferior physical properties. The process is easy to practice, and provides lighter, high-quality polyurethane products, including protective sports equipment, arm rests or steering wheels for the auto industry, and midsoles or shoe soles for footwear.

US Patent:

53301579, Jul 19, 1994

Filed:

Jul 28, 1993

Appl. No.:

8/098145

Inventors:

Charles D. Dern - Feasterville PA
David L. Ho - Hatboro PA

Assignee:

Hull Corporation - Hatboro PA

International Classification:

F16K 122

US Classification:

251162

Abstract:

A rotary disk valve has a valve body provided with an annular valve seat section defining a central opening to be removably closed by a valve disk. The valve disk is supported by a drive assembly which includes a drive shaft mounted on the valve body and supporting a drive link for rotation with the shaft. The link mounts a valve disk support shaft which extends slidably through a slot in a bracket secured to the valve disk. The bracket mounts a guide cam follower pin arranged to engage a guide cam secured to the valve body. The arrangement of drive shaft, valve disk support shaft, bracket slot and guide cam and follower is such that rotation of the drive shaft through 180. degree. in one direction first moves the valve disk from open position disposed in a plane substantially perpendicular to the plane of the central opening in the valve body to an intermediate position spaced from but parallel to the valve seat surface, and then moves the valve disk linearly into sealing engagement with the valve seat section of the valve body. Reverse rotation of the drive shaft moves the valve disk from open to closed position.