William L Chang

US Patent:

54664543, Nov 14, 1995

Filed:

Dec 20, 1994

Appl. No.:

8/361452

Inventors:

William Chang - Rowland Heights CA

International Classification:

A61K 3578

US Classification:

4241951

Abstract:

The present invention provides an improved extraction process of the type in which herbs are boiled in a solvent to produce an herbal liquid that is concentrated to form an herbal extract. In a first phase of the improved process, herbs are boiled in a solvent in an extraction vessel to form an herbal liquid and an herbal vapor; the herbal vapor is drawn into a collection tank, where it is allowed to condense into an herbal condensate that is periodically re-introduced into the herbal liquid in the extraction vessel. In a second phase, a portion of the herbal liquid is drawn into a concentration vessel, where it is concentrated into herbal extract while the herbal liquid continues to boil in the extraction vessel; this second phase is repeated until there is no more herbal liquid in the extraction vessel. In a third and final phase, the last of the herbal liquid drawn into the concentration vessel from the extraction vessel is concentrated into herbal extract.

US Patent:

49502794, Aug 21, 1990

Filed:

Apr 3, 1989

Appl. No.:

7/333132

Inventors:

William Chang - Monterey Park CA

Assignee:

Jen-On Pharmaceutical Enterprises Corp. - Monterrey Park CA

International Classification:

A61B 1734

US Classification:

606189

Abstract:

An acupuncture needle delivery system is disclosed comprising a needle with an upper head portion that is wider in the middle than at its ends. The needle is packaged within a plastic dispensing tube which is greater in diameter than the needle, except at the end of the tube which surrounds the needle's head. The portion of the tube surrounding the head of the needle is narrower than the widest part of the head to snugly grasp the head and secure the needle within the tube. Upon the imposition of axially directed, manually exerted, downward pressure on the head region, the end of the plastic tube stretches, permitting the needle to be ejected from the other end of the tube.

US Patent:

55038107, Apr 2, 1996

Filed:

Dec 20, 1994

Appl. No.:

8/361797

Inventors:

William Chang - Rowland Heights CA

International Classification:

F28D 700
A61K 3578

US Classification:

422235

Abstract:

A preferred embodiment the present invention provides a system for extracting and concentrating active ingredients from herbs. The herbs are boiled in a suitable extraction medium, such as water or alcohol, in an extraction vessel. The extraction vessel is connected to a vacuum line that both serves to lower the pressure of the extraction vessel and to draw off herbal vapor formed in the boiling process. A vapor condenser cools the herbal vapor, forming an herbal condensate that is collected and periodically reintroduced into the extraction vessel, thereby lowering the density of the herbal liquid. After a predetermined period of time, a first portion of herbal liquid is transferred from the extraction vessel to a concentration tank, while the remainder of the herbal liquid continues to boil in the extraction vessel. In a further preferred embodiment of the present invention, the concentration tank is provided with side and bottom heating elements work together to minimize burning of the contents of the concentration tank.