Michael K Pratt

US Patent:

53932854, Feb 28, 1995

Filed:

Oct 30, 1992

Appl. No.:

7/969094

Inventors:

Kenneth A. Fischer - Framingham MA
David L. Landay - Boston MA
Frederick R. Greer - Abington MA
Kenneth W. Pratt - Ware MA
Michael K. Pratt - Ware MA

Assignee:

Mohawk Sports, Inc. - Milford MA

International Classification:

A63B 21075

US Classification:

482108

Abstract:

An exercise device for has a rigid body defining a chamber, at least one first fluid mass disposed to move within the chamber in response to movement of the rigid body during exercise, thereby increasing the effective mass of the device by dynamic movement of the fluid mass during rhythmic exercise, one or more handles for gripping of the device during exercise, and a set of one or more weight adjusting elements that can be removably attached in order to adjust the static base weight of the exercise device. Exercise devices may be constructed for use of one hand or two hands.

US Patent:

61812749, Jan 30, 2001

Filed:

Jun 30, 1999

Appl. No.:

9/343743

Inventors:

Michael M. Pratt - Bolton MA
Brian P. Burke - Lexington MA
Pratap N. Misra - Sudbury MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H04B 7185

US Classification:

34235704

Abstract:

A navigation receiver system provides real-time precise relative positioning in cooperation with an associated carrier phase receiver. The navigation receiver system and the associated carrier phase receiver both sample signals during a single epoch, and the associated carrier phase receiver processes the received signals to provide and transmit first carrier phase measurement data. The navigation receiver system comprises a data link receiver that receives the first carrier phase measurement data from the associated carrier phase receiver, and a carrier phase receiver that receives carrier phase signals during the sampling epoch, and processes the carrier phase signals to provide a second carrier phase measurement data. The navigation system receiver also includes a processing unit that receives the first carrier phase measurement data and the second carrier phase measurement data and computes carrier phase difference measurements. The processing unit applies a local-minima search technique to the carrier phase difference measurements to resolve carrier phase integer ambiguities within the subspace of local minima, wherein the resolved carrier phase integers are subsequently used to determine a precise relative position of the navigation receiver system with respect to the associated carrier phase receiver.