Pijush Kanti Dewanjee

US Patent:

6336869, Jan 8, 2002

Filed:

Oct 4, 2000

Appl. No.:

09/679036

Inventors:

Ronald K. Hettinger - Oceanside CA
Richard C. Helmstetter - Rancho Santa Fe CA
J. Neil Hall - Carlsbad CA
Augustin W. Rollinson - San Diego CA
Kamal Sarkar - San Diego CA
Joshua G. Breier - San Marcos CA
John G. Guard - Oceanside CA
Pijush K. Dewanjee - Carlsbad CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 5304

US Classification:

473324, 473340, 473342, 473349, 273DIG 8

Abstract:

The present invention is a golf club ( ) having a club head main body ( ) with a hollow interior ( ), a support layer defining a depth of a recess ( ), a polymer insert ( ) in the recess ( ), an isolation layer ( ) and a weight body ( ). The polymer insert ( ) is composed of a thermosetting polyurethane material having a Shore D hardness in the range of 42 to 55, and a Bayshore rebound in the range of 51 to 60. The preferred thermosetting polyurethane material is formed from a p-phenylene diisocyanate prepolymer and a curing agent. The golf club ( ) is preferably a putter, however, it may be a wood or an iron. The particular thermosetting polyurethane provides a soft striking face for feel and a good rebound for distance. The weight body ( ) is preferably composed of a tungsten alloy, and the isolation layer ( ) is preferably composed of a thermoplastic polyurethane.

US Patent:

6379266, Apr 30, 2002

Filed:

Mar 16, 2000

Appl. No.:

09/527381

Inventors:

Steven S. Ogg - Carlsbad CA
Pijush K. Dewanjee - Carlsbad CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 3702

US Classification:

473358, 473357

Abstract:

A four-piece golf ball is disclosed herein. The golf ball has a core with an oxygen barrier boundary layer, a wound layer and a polyurethane cover. The core is preferably composed of polybutadiene material. The boundary layer is preferably composed of a blend of ionomers. The cover is preferably composed of a thermosetting polyurethane material. The golf ball has exceptional distance, exceptional feel and exceptional durability.

US Patent:

6390932, May 21, 2002

Filed:

Apr 18, 2000

Appl. No.:

09/551284

Inventors:

John B. Kosmatka - Encinitas CA
David L. Felker - Bonsall CA
Pijush Dewanjee - Oceanside CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 5304

US Classification:

473324, 473326, 473329, 473349, 473350

Abstract:

A golf club head having a face section with a polymer surface can provide a more efficient impact between a golf ball and the golf club head. By utilizing a polymer surface with desired material properties of stress, strain and damping levels, the face section will incur higher strain and strain rate levels than the golf ball. These lower internal stresses within the golf ball yield a more efficient impact with a golf club head.

US Patent:

6390937, May 21, 2002

Filed:

Feb 1, 2000

Appl. No.:

09/495586

Inventors:

Gary G. Marshall - Soddy Daisy TN
Pijush K. Dewanjee - Oceanside CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 3704

US Classification:

473374, 473371, 473373, 473372

Abstract:

A method for determining the concentricity of a golf ball having a barium or bismuth doped boundary layer or cover is disclosed herein. The method uses an X-ray imaging machine to determine the thickness of the cover at various locations to ensure concentricity of the golf ball. The boundary layer may be an ionomer blend doped with barium or bismuth in an amount of five to fifteen parts per hundred of the ionomer material, and the cover may be composed of a thermoset polyurethane material. Alternatively, the cover may be doped with barium or bismuth, and the boundary layer may be undoped.

US Patent:

6395218, May 28, 2002

Filed:

Feb 1, 2000

Appl. No.:

09/496126

Inventors:

Gary G. Marshall - Soddy Daisy TN
Pijush K. Dewanjee - Oceanside CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

B29C 4320

US Classification:

264511, 264275, 2642791, 2642975, 2642976, 2642978, 264335, 264250, 264265

Abstract:

A method and system for casting a thermoset layer over a golf ball precursor product is disclosed herein. The system includes multiple stations connected by a conveyor system. The thermoset flowable material is dispensed into a plurality of cavities on each of the mold halves. A plurality of golf ball precursor products are then centered and inserted into the first mold half cavities. The mold halves are mated, heated and cooled. Then, at a de-molding station, the mold halves are separated and the thermoset layered golf balls are removed from the second mold half. A preferred thermoset material is a thermoset polyurethane.

US Patent:

6422954, Jul 23, 2002

Filed:

Nov 11, 2000

Appl. No.:

09/710591

Inventors:

Pijush K. Dewanjee - Oceanside CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 3704

US Classification:

473378, 473371, 473373, 473374

Abstract:

A golf ball having a polyurethane cover composed of a blend of polyurethane prepolymers is disclosed herein. The blend may be a dual blend with a TDI-based polyurethane prepolymer blended with a second diisocyanate polyurethane prepolymer, typically a PPDI-based polyurethane prepolymer. The blend may also be a tri-blend with a TDI-based polyurethane prepolymer blended with two other diisocyanate polyurethane prepolymers, typically two different PPDI-based polyurethane prepolymers. The golf ball has a durability of at least 3. 5 on a shear test rating of the cover.

US Patent:

6425831, Jul 30, 2002

Filed:

Oct 18, 2000

Appl. No.:

09/692744

Inventors:

Kevin A. Heene - Carlsbad CA
Darren F. Lawlor - Carlsbad CA
Maxine J. Besaw - Vista CA
Clydene S. C. Nee - San Diego CA
Herbert Reyes - Laguna Niguel CA
Wayne H. Byrne - Murrieta CA
Pijush K. Dewanjee - Carlsbad CA
Richard C. Helmstetter - Rancho Santa Fe CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 5304

US Classification:

473332, 473340, 473342

Abstract:

A golf club head with a polymer insert having indicia printed directly on its surface is disclosed herein. The polymer insert is disposed in a recess of the club head, and is preferably composed of a thermosetting material. Preferably, an UV curable ink is utilized for the indicia. The UV ink is printed on the external surface of the insert through a transfer pad printing process, and then cured with UV energy. Preferably, the golf club head is a putter, and the insert is composed of a thermosetting polyurethane. The insert is preferably white, and the indicia is preferably multi-colored.

US Patent:

6435987, Aug 20, 2002

Filed:

Nov 11, 2000

Appl. No.:

09/710732

Inventors:

Pijush K. Dewanjee - Oceanside CA

Assignee:

Callaway Golf Company - Carlsbad CA

International Classification:

A63B 3712

US Classification:

473378

Abstract:

A golf ball having a thermosetting polyurethane cover composed of a blend of polyurethane prepolymers is disclosed herein. The blend may be a dual blend with a TDI-based polyurethane prepolymer blended with a second diisocyanate polyurethane prepolymer, typically a PPDI-based polyurethane prepolymer. The blend may also be a tri-blend with a TDI-based polyurethane prepolymer blended with two other diisocyanate polyurethane prepolymers, typically two different PPDI-based polyurethane prepolymers. The golf ball has a durability of at least 3. 5 on a shear test rating of the cover.