Daniel C Snow

US Patent:

56382596, Jun 10, 1997

Filed:

May 9, 1995

Appl. No.:

8/437482

Inventors:

William F. McCarthy - Marblehead MA
Colin E. Brench - Stow MA
Daniel M. Snow - Maynard MA

Assignee:

Digital Equipment Corporation - Maynard MA

International Classification:

H05K 900

US Classification:

361800

Abstract:

A Faraday shield minimizes the leakage of electromagnetic interference (EMI) and radio frequency interference (RFI) of a maximum frequency and corresponding wavelength that emanates from electronic components contained within the shield. The top and bottom each contain apertures that are dimensioned to effectively block the escape of EMI and RFI from the shield and to permit the flow of air to dissipate heat without generating acoustic noise. The thickness of the top of the shield is at least one half of the diagonal length across the largest of the apertures located in the top. The length of the longest aperture side is less than one fourth of the wavelength of the maximum frequency of EMI and RFI contained by the shield. Corresponding relationships exist between the apertures located in the shield bottom and its thickness.

US Patent:

52893472, Feb 22, 1994

Filed:

Jun 4, 1992

Appl. No.:

7/893398

Inventors:

William F. McCarthy - Marblehead MA
Colin E. Brench - Stow MA
Daniel M. Snow - Maynard MA

Assignee:

Digital Equipment Corporation - Maynard MA

International Classification:

H05K 502

US Classification:

361809

Abstract:

A Faraday shield minimizes the leakage of electromagnetic interference (EMI) and radio frequency interference (RFI) of a maximum frequency and corresponding wavelength that emanates from electronic components contained within the shield. The top and bottom each contain apertures that are dimensioned to effectively block the escape of EMI and RFI from the shield and to permit the flow of air to dissipate heat without generating acoustic noise. The thickness of the top of the shield is at least one half of the diagonal length across the largest of the apertures located in the top. The length of the longest aperture side is less than one fourth of the wavelength of the maximum frequency of EMI and RFI contained by the shield. Corresponding relationships exist between the apertures located in the shield bottom and its thickness.

US Patent:

D3476243, Jun 7, 1994

Filed:

Apr 29, 1992

Appl. No.:

7/875854

Inventors:

William F. McCarthy - Marblehead MA
Kenneth R. Palumbo - Westminster MA
Robert D. Hellweg - Natick MA
Richard M. Masters - Lexington MA
Colin E. Brench - Stow MA
Daniel M. Snow - Maynard MA
Peter B. Barron - Marlow Bucks, GB2
Michael Freeman - Reading, GB2
Christopher H. Williams - Reading, GB2

Assignee:

Digital Equipment Corporation - Maynard MA

US Classification:

D13184

US Patent:

53988221, Mar 21, 1995

Filed:

Nov 10, 1993

Appl. No.:

8/150608

Inventors:

William F. McCarthy - Marblehead MA
Colin E. Brench - Stow MA
Daniel M. Snow - Maynard MA

Assignee:

Digital Equipment Corporation - Maynard MA

International Classification:

A47F 500

US Classification:

211 41

Abstract:

A Faraday shield minimizes the leakage of electromagnetic interference (EMI) and radio frequency interference (RFI) of a maximum frequency and corresponding wavelength that emanates from electronic components contained within the shield. The top and bottom each contain apertures that are dimensioned to effectively block the escape of EMI and RFI from the shield and to permit the flow of air to dissipate heat without generating acoustic noise. The thickness of the top of the shield is at least one half of the diagonal length across the largest of the apertures located in the top. The length of the longest aperture side is less than one fourth of the wavelength of the maximum frequency of EMI and RFI contained by the shield. Corresponding relationships exist between the apertures located in the shield bottom and its thickness.

US Patent:

55350992, Jul 9, 1996

Filed:

Nov 28, 1994

Appl. No.:

8/345875

Inventors:

William F. McCarthy - Marblehead MA
Colin E. Brench - Stow MA
Daniel M. Snow - Maynard MA

Assignee:

Digital Equipment Corporation - Maynard MA

International Classification:

H05K 720

US Classification:

361800

Abstract:

A Faraday shield minimizes the leakage of electromagnetic interference (EMI) and radio frequency interference (RFI) of a maximum frequency and corresponding wavelength that emanates from electronic components contained within the shield. The top and bottom each contain apertures that are dimensioned to effectively block the escape of EMI and RFI from the shield and to permit the flow of air to dissipate heat without generating acoustic noise. The thickness of the top of the shield is at least one half of the diagonal length across the largest of the apertures located in the top. The length of the longest aperture side is less than one fourth of the wavelength of the maximum frequency of EMI and RFI contained by the shield. Corresponding relationships exist between the apertures located in the shield bottom and its thickness.