David V Holland

US Patent:

61955531, Feb 27, 2001

Filed:

Apr 20, 1999

Appl. No.:

9/294490

Inventors:

Douglas J. Claffery - Malvern PA
David M. Holland - Reading PA
James W. Woodburn - King of Prussia PA

Assignee:

Analytical Graphics, Inc. - Malvern PA

International Classification:

H04Q 720

US Classification:

455445

Abstract:

The present invention relates to a method and apparatus for selecting a path between an originating point and a destination point in a communications network comprising a number of objects for a certain time interval. The method comprises constructing a link availability matrix which comprises a start time and an end time for a link between any two objects in the communications network. The start time for all links in the link availability matrix are arranged in a chronological order. A cost matrix is generated for the first start time in the link availability matrix based on selected factors and continuing through the following start times until a connecting path is found between the originating point and destination point using a number of objects in the network. After a connecting path is found, a first disconnect time based on the end times in the link availability matrix for the objects in the connecting path is selected. Steps (c) and (d) are repeated for all subsequent start time in the link availability matrix for the time interval to identify other connecting paths for the origination and destination points.

US Patent:

53277147, Jul 12, 1994

Filed:

Jul 30, 1992

Appl. No.:

7/921771

Inventors:

Kenneth A. Stevens - Lansdale PA
David T. Holland - Pennington NJ

Assignee:

Prince Manufacturing, Inc. - Lawrenceville NJ

International Classification:

D02G 306
A63B 5102

US Classification:

57230

Abstract:

A string for sports application, in particular for tennis, badminton, racquetball and squash racquets or the like comprises a center core and at least one ribbon-like wrap made of a highly abrasion resistant material which exhibits a higher melting point and at least one of a higher dynamic stiffness and a lower static stiffness than the core material. A preferred wrap material meeting the above criteria is poly(m-phenylene isophthalamide). The wrap should cover at least 25%, and preferably at least 50% of the center core's outer surface to reduce notching. Due to the reduced notching, superior combined properties of durability, playability and minimal loss of string tension are achieved.