John F Wiedmann

US Patent:

61546860, Nov 28, 2000

Filed:

Mar 27, 1998

Appl. No.:

9/049512

Inventors:

Peter J. Hefferen - Pittsburgh PA
Christopher E. Kikta - Pittsburgh PA
Bruce D. Arnold - Murrysville PA
John F. Wiedmann - Pittsburgh PA

Assignee:

Innovex Technologies - Turtle Creek PA

International Classification:

G05B 1300
G05B 1500
G05B 2100

US Classification:

700276

Abstract:

A system for controlling the operation of a laboratory with a fume hood having a sash. The system includes an intelligent occupancy monitor mechanism. The system includes an intelligent sash closure mechanism. The producing mechanism and the controlling mechanism form a fully distributed intelligent non-hierarchical architecture. The system includes a network to which the producing mechanism and the controlling mechanism are connected to communicate with each other. A method for controlling air flow in a fume hood.

US Patent:

59888601, Nov 23, 1999

Filed:

Jul 18, 1996

Appl. No.:

8/683799

Inventors:

Peter J. Hefferen - Pittsburgh PA
Christopher E. Kikta - Pittsburgh PA
John F. Wiedmann - Sewickley PA

Assignee:

Innovex Technologies, Inc. - Turtle Creek PA

International Classification:

F23J 1112
G05D 706

US Classification:

36452811

Abstract:

A system for directing air flow in a fume hood having a sash includes a mechanism for producing an output control signal corresponding to a desired flow of air through the sash of the fume hood. The producing mechanism includes a CPU which actively produces the output control signal and is disposed in fluid communication with the fume hood. The system also includes a mechanism for controlling air flow through the sash of the fume hood corresponding to the output control signal. The controlling mechanism is connected to the producing mechanism to receive the output control signal and includes a CPU which actively produces a drive signal for operating the controlling mechanism corresponding to the output control signal. A corresponding method for controlling the air flow in a fume hood is also provided. Also a corresponding system for maintaining a desired relationship regarding air between a first room and a second room separated from but connected to the first room by a wall with an interface through which air can pass when the interface is in an open state is provided.