Curtis W Martin

US Patent:

7685922, Mar 30, 2010

Filed:

Oct 5, 2007

Appl. No.:

11/973990

Inventors:

Curtis A. Martin - Damascus MD, US
Gilbert F. Lee - Greenbelt MD, US
Jeffry J. Fedderly - Ellicott City MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F41H 5/02

US Classification:

89 3602, 89 3604, 89 3601

Abstract:

The present invention's stratified composite material system of armor, as typically embodied, comprises a strike stratum and a backing stratum. The strike stratum includes elastomeric matrix material and inventive ceramic-inclusive elements embedded therein and arranged (e. g. , in one or more rows and one or more columns) along a geometric plane corresponding to the front (initial strike) surface of the strike stratum. More rigid than the strike stratum, the backing stratum is constituted by, e. g. , metallic (metal or metal alloy) material or fiber-reinforced polymeric matrix material. Some inventive embodiments also comprise a spall-containment stratum fronting the strike stratum. The inventive ceramic-inclusive elements geometrically describe any of various inventive modes, including: first mode, having a flat front face and a textured back face; second mode, having a pyramidal front section and a prismatoidal (especially, prismoidal, e. g. , truncated pyramidal or prismatic) body section; hybrid mode, combining features of first and second modes.

US Patent:

8069770, Dec 6, 2011

Filed:

Apr 24, 2009

Appl. No.:

12/429444

Inventors:

Curtis A. Martin - Damascus MD, US
Bruce J. Wells - Middletown MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F41H 5/02

US Classification:

89 3602, 89 3607, 89 3608, 89 3609, 89906, 428911, 109 495

Abstract:

A method and device for protecting a surface. The device includes modular spaced armor assemblies having a ceramic face plate, a composite backing plate, and a lightweight low-density module therebetween. The modular spaced armor assemblies may be tiled to form a protective arrangement for protecting a desired surface. The lightweight low-density module includes one or more gas filled cavities.

US Patent:

8096224, Jan 17, 2012

Filed:

Mar 25, 2010

Appl. No.:

12/731675

Inventors:

Curtis A. Martin - Damascus MD, US
Gilbert F. Lee - Greenbelt MD, US
Jeffry J. Fedderly - Ellicott City MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F41H 5/00

US Classification:

89 3602, 89904, 89906, 89908, 89917

Abstract:

The present invention's stratified composite material system of armor, as typically embodied, comprises a strike stratum and a backing stratum. The strike stratum includes elastomeric matrix material and inventive ceramic-inclusive elements embedded therein and arranged (e. g. , in one or more rows and one or more columns) along a geometric plane corresponding to the front (initial strike) surface of the strike stratum. More rigid than the strike stratum, the backing stratum is constituted by, e. g. , metallic (metal or metal alloy) material or fiber-reinforced polymeric matrix material. Some inventive embodiments also comprise a spall-containment stratum fronting the strike stratum. The inventive ceramic-inclusive elements geometrically describe any of various inventive modes, including: first mode, having a flat front face and a textured back face; second mode, having a pyramidal front section and a prismatoidal (especially, prismoidal, e. g. , truncated pyramidal or prismatic) body section; hybrid mode, combining features of first and second modes.

US Patent:

8105510, Jan 31, 2012

Filed:

Oct 5, 2007

Appl. No.:

11/973999

Inventors:

Curtis A. Martin - Damascus MD, US
David E. Johnson - Glen Burnie MD, US
David P. Owen - Columbia MD, US
Rodney O. Peterson - Frederick MD, US
Philip J. Dudt - North Bethesda MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B29C 39/18

US Classification:

264 26, 264275

Abstract:

The present invention's stratified composite system of armor, as typically embodied, comprises a backing stratum and a strike stratum that includes elastomeric matrix material and low-density ceramic elements embedded therein and arranged (e. g. , in one or more rows and one or more columns) along a geometric plane (or plural parallel geometric planes) corresponding to the front surface of the strike stratum. Some inventive embodiments also comprise a spall-containment stratum fronting the strike stratum. The density of the low-density ceramic material is in the approximate range 2. 0-3. 0 g/cm. In the strike stratum, the volume ratio of the low-density ceramic material to the elastomeric matrix material is in the approximate range 4-20. The present invention's emulative method for designing an inventive armor system typically involves configurative change of the inventive armor system's low-density ceramic material vis-à-vis another armor system's high-density ceramic material so that the respective ceramic material areal densities are equal.

US Patent:

8105967, Jan 31, 2012

Filed:

Sep 26, 2008

Appl. No.:

12/286285

Inventors:

Curtis A. Martin - Damascus MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

C04B 35/00
B32B 3/26

US Classification:

501 974, 4283044

Abstract:

According to typical inventive practice, precursor particulate is pressed and/or caste and/or molded and/or machined, thereby producing a porous green body of a desired shape. A gas is brought into contact with the porous green body so that, via reaction bonding between the gas and the porous green body, the porous green body becomes a porous reaction-bonded ceramic preform, geometrically corresponding to the porous green body. One or more infiltrant materials, at least one of which is glass or polymer, is/are caused to infiltrate the pores of the RB ceramic perform. The infiltrants are selected from glass, polymer, and metal. The infiltrated preform is permitted to cool and solidify, resulting in an embodiment of an inventive non-ceramic-infiltrated reaction-bonded-ceramic structure. Because of their potential material attributes such as strength, energy dissipation, and low density, the present invention's non-ceramic-infiltrated reaction-bonded-ceramic structures are especially favorable for inclusion in personal/personnel ballistic armor systems.

US Patent:

8226873, Jul 24, 2012

Filed:

Jan 31, 2012

Appl. No.:

13/362856

Inventors:

Curtis A. Martin - Damascus MD, US
David E. Johnson - Glen Burnie MD, US
David P. Owen - Columbia MD, US
Rodney O. Peterson - Frederick MD, US
Philip J. Dudt - North Bethesda MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B29C 39/18
F41H 5/04

US Classification:

264261, 264275, 89 3602, 89906, 89908, 89918, 703 6

Abstract:

The present invention's stratified composite system of armor, as typically embodied, comprises a backing stratum and a strike stratum that includes elastomeric matrix material and low-density ceramic elements embedded therein and arranged (e. g. , in one or more rows and one or more columns) along a geometric plane (or plural parallel geometric planes) corresponding to the front surface of the strike stratum. Some inventive embodiments also comprise a spall-containment stratum fronting the strike stratum. The density of the low-density ceramic material is in the approximate range 2. 0-3. 0 g/cm. In the strike stratum, the volume ratio of the low-density ceramic material to the elastomeric matrix material is in the approximate range 4-20. The present invention's emulative method for designing an inventive armor system typically involves configurative change of the inventive armor system's low-density ceramic material vis-à-vis another armor system's high-density ceramic material so that the respective ceramic material areal densities are equal.

US Patent:

8387510, Mar 5, 2013

Filed:

Dec 22, 2011

Appl. No.:

13/334970

Inventors:

Curtis A. Martin - Damascus MD, US
Gilbert F. Lee - Greenbelt MD, US
Jeffry J. Fedderly - Ellicott City MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F41H 5/02

US Classification:

89 3602, 89903, 89907

Abstract:

The present invention's stratified composite material system of armor, as typically embodied, comprises a strike stratum and a backing stratum. The strike stratum includes elastomeric matrix material and inventive ceramic-inclusive elements embedded therein and arranged (e. g. , in one or more rows and one or more columns) along a geometric plane corresponding to the front (initial strike) surface of the strike stratum. More rigid than the strike stratum, the backing stratum is constituted by, e. g. , metallic (metal or metal alloy) material or fiber-reinforced polymeric matrix material. Some inventive embodiments also comprise a spall-containment stratum fronting the strike stratum. The inventive ceramic-inclusive elements geometrically describe any of various inventive modes, including: first mode, having a flat front face and a textured back face; second mode, having a pyramidal front section and a prismatoidal (especially, prismoidal, e. g. , truncated pyramidal or prismatic) body section; hybrid mode, combining features of first and second modes.

US Patent:

8580387, Nov 12, 2013

Filed:

Sep 27, 2011

Appl. No.:

13/245901

Inventors:

Jeffry J. Fedderly - Ellicott City MD, US
Gilbert F. Lee - Greenbelt MD, US
Curtis A. Martin - Damascus MD, US
Edward Balizer - Bethesda MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B32B 27/40
C08G 18/32
C08G 18/60

US Classification:

4284231, 428911, 428912, 252609, 528 64, 528 68

Abstract:

A composite armor including a ballistic armor layer and a directly attached polyurea layer. The polyurea layer is the cured reaction product of an isocyanate curing agent and a mixture of diamines having the general formula:HN-Ph-(C═O)—O—(CH—CH—CH—CH—O)—(C═O)-Ph-NH,wherein in the mixture n in the ranges from 3 to 14 and the weight average value of n is about 9 to 10. Ph represents phenyl. In a preferred embodiment, the polyurea layer is the strike face. The composite armor is useful for light armor applications in which weight is a factor such as military vehicle armor and military boat armor.