Donald F Rogowski, 64325 Long Lake Dr, Covington, LA 70435

5684707, Nov 4, 1997

Aug 11, 1995

8/514622

Donald Frank Rogowski - Covington VA

Westvaco Corporation - New York NY

G06F 1900
D21F 706

36447103

This invention relates to an apparatus and method for identifying periodic roughness variations on a paper surface. Such devices of this type, generally, collect topography data from the paper surface, analyze the data, and compare the data with known signature topographies of paper machine clothing and equipment to determine the location in the paper manufacturing process where the periodic roughness variations on the paper surface are being produced.

5614662, Mar 25, 1997

Dec 9, 1994

8/352893

Matthew J. Hallan - Savage MN
Stephen J. Paradis - Los Altos Hills CA
Donald F. Rogowski - Covington VA
Michael L. Shephard - Covington VA

Westvaco Corporation - New York NY

G01B 528

73105

Subjective paper characteristics such as visual appearance and print quality are often objectively related to certain scales of surface roughness. Three dimensional topographic surface data is obtained from a paper sample secured by vacuum to a flat, porous plate for translational movement in a grid pattern beneath a vertically compliant stylus that is resiliently suspended beneath a rigid, overhead support beam. Such surface data is mathematically filtered by a linear convolution technique or the distinctly alternative circular convolution technique to segregate the raw data characteristics of component surfaces that contain only certain frequencies of roughness. The root-mean-square variations of such component surfaces is then used to objectively characterize respective surface characteristics.

5769330, Jun 23, 1998

Apr 16, 1996

8/633199

Donald Frank Rogowski - Covington VA

Westvaco Corporation - New York NY

B02C 1906
B02C 1912

241 5

This invention relates to a spouted bed wood chip debarker/cleaner. Such structures of this type, generally, cause wood chips and bark to undergo attrition by accelerating the wood chips and bark with a jet of air. In particular, the accelerated wood chips and bark are impinged on a screen. When the wood chips hit the screen, bark and wood chips experience attrition. Small pieces of bark and other debris (sand, for example) will be exhausted through the screen which is too fine of a mesh to let desirable size wood chips be exhausted.