Gerald E Duffy

Author:

Gerald G. Duffy

ISBN #:

0060417846

Author:

Gerald G. Duffy

ISBN #:

0060417862

Author:

Gerald G. Duffy

ISBN #:

0060417935

Author:

Gerald G. Duffy

ISBN #:

0060417943

Author:

Gerald G. Duffy

ISBN #:

0070180342

Author:

Gerald G. Duffy

ISBN #:

0872071189

Author:

Gerald G. Duffy

ISBN #:

0872071219

US Patent:

6424097, Jul 23, 2002

Filed:

May 12, 2000

Appl. No.:

09/569541

Inventors:

Henry Frazier Pruett - Sandy OR
Gerald E. Duffy - Portland OR

Assignee:

InFocus Corporation - Wilsonville OR

International Classification:

H05B 3702

US Classification:

315219, 315209 R, 315362, 307328, 361 7

Abstract:

A safety interlock apparatus for an electrical device includes a DC power supply, a ballast power supply including a ballast control circuit that controls a ballast power circuit, and a lamp. A relatively low voltage electrical connection is present between the DC power supply and the ballast control circuit. A relatively high voltage electrical connection is present between the lamp and the ballast power circuit. A safety interlock switch is positioned on the relatively low voltage electrical connection, the switch having a closed state wherein the relatively low voltage is supplied to the ballast control circuit and an open disconnected state wherein the relatively low voltage electrical connection is disconnected. A panel is fixable to the electrical device frame, and is selectively movable to expose the lamp for removal. The panel has a switch actuator positioned thereon operable to actuate the interlock switch to the open disconnected state when the panel is removed from the device, thereby disconnecting power to the ballast control circuit, which in turn immediately disables the ballast power circuit, rendering the lamp safe for removal.

US Patent:

6853152, Feb 8, 2005

Filed:

Jul 1, 2002

Appl. No.:

10/188306

Inventors:

Henry Frazier Pruett - Sandy OR, US
Gerald E. Duffy - Portland OR, US

Assignee:

InFocus Corporation - Wilsonville OR

International Classification:

H05B037/02

US Classification:

315219, 315209 R, 315362, 307328, 307140

Abstract:

A safety interlock apparatus for an electrical device includes a DC power supply, a ballast power supply including a ballast control circuit that controls a ballast power circuit, and a lamp. A relatively low voltage electrical connection is present between the DC power supply and the ballast control circuit. A relatively high voltage electrical connection is present between the lamp and the ballast power circuit. A safety interlock switch is positioned on the relatively low voltage electrical connection, the switch having a closed state wherein the relatively low voltage is supplied to the ballast control circuit and an open disconnected state wherein the relatively low voltage electrical connection is disconnected. A panel is fixable to the electrical device frame, and is selectively movable to expose the lamp for removal. The panel has a switch actuator positioned thereon operable to actuate the interlock switch to the open disconnected state when the panel is removed from the device, thereby disconnecting power to the ballast control circuit, which in turn immediately disables the ballast power circuit, rendering the lamp safe for removal.

US Patent:

7091670, Aug 15, 2006

Filed:

Sep 13, 2004

Appl. No.:

10/940228

Inventors:

Henry Frazier Pruett - Mulino OR, US
Gerald E. Duffy - Portland OR, US

Assignee:

InFocus Corporation - Wilsonville OR

International Classification:

H05B 37/02

US Classification:

315219, 315209 R, 307140

Abstract:

A safety interlock apparatus for an electrical device includes a DC power supply, a ballast power supply including a ballast control circuit that controls a ballast power circuit, and a lamp. A relatively low voltage electrical connection is present between the DC power supply and the ballast control circuit. A relatively high voltage electrical connection is present between the lamp and the ballast power circuit. A safety interlock switch is positioned on the relatively low voltage electrical connection, the switch having a closed state wherein the relatively low voltage is supplied to the ballast control circuit and an open disconnected state wherein the relatively low voltage electrical connection is disconnected. A panel is fixable to the electrical device frame, and is selectively movable to expose the lamp for removal. The panel has a switch actuator positioned thereon operable to actuate the interlock switch to the open disconnected state when the panel is removed from the device, thereby disconnecting power to the ballast control circuit, which in turn immediately disables the ballast power circuit, rendering the lamp safe for removal.

US Patent:

57933529, Aug 11, 1998

Filed:

Mar 7, 1996

Appl. No.:

8/612348

Inventors:

Robert Y. Greenberg - Portland OR
Jorell A. Olson - Portland OR
Gerald E. Duffy - Portland OR
Mark E. Schoening - Portland OR

Assignee:

In Focus Systems, Inc. - Wilsonville OR

International Classification:

H01B 1102

US Classification:

345132

Abstract:

The present invention includes a multimedia projection system coupling apparatus having a coupling converter for interconnecting at least one multimedia source and a multimedia projection display system. The coupler system includes at least two source cables that extend from the multimedia source and carry to the coupling converter media signals corresponding to different media, such as video and system control. The coupling converter delivers corresponding media signals to a projector terminal from which a projector cable extends to the projection display system. In the preferred embodiment, the coupling converter includes signal format conversion circuitry for converting each media signal or its component to a differential signal format, and the projector cable preferably includes a separate twisted pair of wires for carrying each of the differential format signals.