John Richard Kent

US Patent:

43165796, Feb 23, 1982

Filed:

Apr 11, 1980

Appl. No.:

6/138868

Inventors:

Charles A. Ray - Arcadia CA
John L. Kent - Ontario CA

Assignee:

Anthony Manufacturing Company - Azusa CA

International Classification:

B05B 1510

US Classification:

239123

Abstract:

For use with a pop-up sprinkler of the full or part circle type, a multi-purpose seal is provided between the movable stem of the pop-up sprinkler and a stationary mounting base which is fixed with respect to the sprinkler housing. The seal is preferably a unitary molded article and includes a grit wiper at its upper end, a central bearing to slidingly guide the stem within the housing, a sliding water-activated seal, and an annular static seal for providing a watertight seal between the movable stem and stationary housing during normal operation of the sprinkler.

US Patent:

44527756, Jun 5, 1984

Filed:

Dec 3, 1982

Appl. No.:

6/446749

Inventors:

John S. Kent - Palo Alto CA

Assignee:

Syntex (U.S.A.) Inc. - Palo Alto CA

International Classification:

A61K 926
A61K 3156
A61K 3702
A61K 3726

US Classification:

424 19

Abstract:

Delivery systems for releasing macromolecular active agents to a body site at a controlled rate for a prolonged period of time, comprising a cholesteric matrix permeable to passage of the macromolecular active agent by diffusion, are disclosed. The cholesteric matrix comprises cholesterol powder and cholesterol prills optionally in combination with a binding agent and a lubricating agent. The macromolecular active agent is dispersed throughout the matrix; macromolecules suitable for release from this delivery system have molecular weights of about 1300 to about 75,000 and are at least very slightly soluble in water.