Philip C Marshall

US Patent:

D457659, May 21, 2002

Filed:

Oct 13, 2000

Appl. No.:

29/131140

Inventors:

Philip Marshall - Pittsburgh PA

Assignee:

Chelsea Building Products, Inc. - Oakmont PA

International Classification:

2501

US Classification:

D25124

US Patent:

D461013, Jul 30, 2002

Filed:

Jul 10, 2001

Appl. No.:

29/144778

Inventors:

Philip Marshall - Pittsburgh PA

Assignee:

Chelsea Building Products, Inc. - Oakmont PA

International Classification:

2501

US Classification:

D25124

US Patent:

D461014, Jul 30, 2002

Filed:

Jul 10, 2001

Appl. No.:

29/144805

Inventors:

Philip Marshall - Pittsburgh PA

Assignee:

Chelsea Building Products, Inc. - Oakmont PA

International Classification:

2501

US Classification:

D25124

US Patent:

6834180, Dec 21, 2004

Filed:

May 21, 2001

Appl. No.:

09/988101

Inventors:

Philip J. Marshall - Newton MA

Assignee:

Cellco Partnership - Bedminster NJ

International Classification:

H04B 1700

US Classification:

455 6711, 455446, 4554221, 455423, 455424

Abstract:

A system and method that provides radio field strength modeling useful for determining cellular telephone site coverage. The system and method automate sampling procedures, collecting data at various monitoring points within a radio propagation coverage area. The collected data is then interpolated and spurious samples are eliminated. The resultant radio field strength data and respective location data is then analyzed using either a modified Newton second order gradient or a pseudo-exhaustive search method to modeling the field strength for convex and non-convex models, respectively. An iterative approach is used to facilitate the use of model constraints and to mitigate calibration errors attributable to highly correlated variables. For pseudo-exhaustive searches, noise is introduced into the data analysis routines to avoid convergence on local minimum which would otherwise inhibit convergence towards global solutions.

US Patent:

50834630, Jan 28, 1992

Filed:

Feb 7, 1990

Appl. No.:

7/476175

Inventors:

Philip Marshall - Lexington MA
Paul Ford - Maynard MA

Assignee:

M/RAD Corporation - Woburn MA

International Classification:

G01N 2900
B06B 300

US Classification:

73663

Abstract:

A vibration test fixture assembly for releasably securing a test object to the top surface of a sliptable and for rotatably supporting the test object so that the test object can be repositioned between vibration tests without detaching the test object from the fixture. The assembly comprises a bottom plate, a top plate positioned on top of the bottom plate, and a plurality of spring-loaded bearing assemblies between the top and bottom plates for permitting the top plate to rotate relative to the bottom plate except when a downward force of sufficient magnitude to overcome the spring bias of the bearing assemblies is applied to the top plate. The assembly also comprises a plurality of clamps positioned adjacent the top plate for applying a downward force to the top plate sufficient to overcome the spring bias of the bearing assemblies and cause the top plate to engage the bottom plate. The test object is secured to the top plate and the bottom plate is secured to the top surface of a sliptable.

US Patent:

D4448944, Jul 10, 2001

Filed:

Oct 13, 2000

Appl. No.:

D/131139

Inventors:

Philip Marshall - Pittsburgh PA

Assignee:

Chelsea Building Products, Inc. - Oakmont PA

International Classification:

2501

US Classification:

D25124

US Patent:

D4488644, Oct 2, 2001

Filed:

Oct 13, 2000

Appl. No.:

D/131141

Inventors:

Philip Marshall - Pittsburgh PA

Assignee:

Chelsea Building Products, Inc. - Oakmont PA

International Classification:

2501

US Classification:

D25124

US Patent:

51996901, Apr 6, 1993

Filed:

Jul 30, 1992

Appl. No.:

7/922650

Inventors:

Philip Marshall - Lexington MA

Assignee:

M/RAD Corporation - Woburn MA

International Classification:

F16F 922
F16F 943

US Classification:

267 6425

Abstract:

An active vibration isolation system which has three groups of airbag springs for supporting a load and isolating the load from vibration, together with a servo-valve system for admitting pressurized air to or exhausting pressurized air from each group of the airbag springs, and a damping system for damping movement of the load. The damping system comprises a plurality of pairs of shock absorbers which are mounted in parallel with and adjacent to the airbag springs. The shock absorbers are arranged so as to provide damping for each of the groups of airbag springs in three mutually-orthogonal directions.