Walter C May

US Patent:

7208115, Apr 24, 2007

Filed:

Mar 31, 2003

Appl. No.:

10/401873

Inventors:

Edward W. Sheridan - Ocala FL, US
Walter B. May - Orlando FL, US
Gene P. Shumaker - Orlando FL, US
Michael Griffith - Oakland FL, US
Donald G. Rollin - Orlando FL, US
Bobby G. Isler - Lady Lake FL, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

B32B 37/16

US Classification:

264258, 2643281, 264571, 156285, 174 35 MS

Abstract:

An exemplary method of manufacturing a polymer matrix composite electromagnetic shielding structure includes pretreating a dry fiber reinforcement with a composition including a carrier and a conductive element, laying out the pretreated reinforcement to form a pre-form structure, applying a resin to the pre-form structure, and curing the resin at room temperature. Another exemplary method of manufacturing a polymer matrix composite electromagnetic shielding structure includes laying out a plurality of dry fiber reinforcements, placing at least one ply between any two of the plurality of dry fiber reinforcements, the ply having a non-woven including a conductive material, applying a resin to the plurality of dry fiber reinforcements and the at least one ply, and curing the resin.

US Patent:

57210195, Feb 24, 1998

Filed:

Jun 7, 1995

Appl. No.:

8/475818

Inventors:

H. Carl Ashcraft - Orlando FL
Walter B. May - Orlando FL
Douglas R. Dowell - Orlando FL

Assignee:

Martin Marietta Corporation - Bethesda MD

International Classification:

B05D 700

US Classification:

427425

Abstract:

An EMI shielding member and method of making the member. The member includes a non-metallic substrate having an electrically non-conductive coating of a dielectric polymer matrix material loaded with an EMI shieldingly effective amount of electrically conductive fibers. The member can be formed by spraying the fiber loaded, dielectric polymer matrix onto a flexible fabric or tape.

US Patent:

58859110, Mar 23, 1999

Filed:

Sep 5, 1996

Appl. No.:

8/708901

Inventors:

H. Carl Ashcraft - Orlando FL
Walter B. May - Orlando FL
Douglas R. Dowell - Orlando FL

Assignee:

Martin Marietta Corporation - Bethesda MD

International Classification:

B32B 528
B32B 2712
H05K 900

US Classification:

442117

Abstract:

An EMI shielding member and method of making the member. The member includes a non-metallic substrate having an electrically non-conductive coating of a dielectric polymer matrix material loaded with an EMI shieldingly effective amount of electrically conductive fibers. The member can be formed by spraying the fiber loaded, dielectric polymer matrix onto a flexible fabric or tape.

US Patent:

54000432, Mar 21, 1995

Filed:

May 11, 1994

Appl. No.:

8/240808

Inventors:

Walter S. Arceneaux - Orlando FL
Rickey D. Akins - Orlando FL
Walter B. May - Orlando FL

Assignee:

Martin Marietta Corporation - Bethesda MD

International Classification:

H01Q 142
H01Q 1700

US Classification:

343872

Abstract:

An absorptive/transmissive structure is disclosed which can be used to fabricate antenna radomes to thereby reduce the electromagnetic signature of the radome and antenna without disrupting the electromagnetic waves generated by the antenna. An artificial dielectric material is placed on a frequency selective surface to absorb the energy of electromagnetic waves at a particular frequency or range of frequencies.

US Patent:

56614845, Aug 26, 1997

Filed:

Jul 5, 1996

Appl. No.:

8/675809

Inventors:

Gene P. Shumaker - Orlando FL
Walter B. May - Orlando FL

Assignee:

Martin Marietta Corporation - Bethesda MD

International Classification:

H01Q 1700

US Classification:

342 1

Abstract:

In a radar absorbing material, first or relatively resistive fibers are combined with second or relatively conductive fibers in a dielectric binder. Preferably, the first fibers are graphite filaments and the second fibers are metal coated graphite filaments. The appropriate selection of fibers results in a material having broadband or multi-frequency RF absorbing properties.