Robert M Cassidy

US Patent:

44616309, Jul 24, 1984

Filed:

Sep 30, 1982

Appl. No.:

6/430369

Inventors:

Robert T. Cassidy - Waldwick NJ
Kishore J. Doshi - Mahopac NY

Assignee:

Union Carbide Corporation - Danbury CT

International Classification:

B01D 5304

US Classification:

55 25

Abstract:

A portion of the void space gas released from an adsorbent bed during the cocurrent depressurization thereof, and to be used to provide purge gas, is passed directly to a bed to be purged. The remaining portion of such gas is passed simultaneously to an external surge drum. The gas in the external drum is thereafter passed to a bed to be purged.

US Patent:

59164174, Jun 29, 1999

Filed:

Aug 22, 1997

Appl. No.:

8/916511

Inventors:

Robert F. Cassidy - Warwick NY
Anant D. Mahale - Chester NY
Dennis J. Kerstanski - Warwick NY
Robert V. Mahony - Greenwood Lake NY

Assignee:

International Paper Company - Purchase NY

International Classification:

D21F 1104

US Classification:

162125

Abstract:

Stiffness improvements for multi-ply paperboard laid from chemically pulped softwood and hardwood papermaking furnish are obtained by fiber fractionating the softwood pulp and repositioning the resulting fractions. Chemically pulped and preferably bleached softwood fiber "rejects" of a fractionation screen are redistributed into the outer plies of a three-ply, 300-350 g/m (approximately 195 #/3,000 ft. ) basis weight paperboard. The fractionation "accepts" are repositioned to the center ply for a 12% to 15% increase in Taber stiffness. The short, "accept" fiber from the fractionation screen is mixed with chemically pulped hardwood fiber or modified mechanical pulp of either species for formation of the center ply on a multiformer paper machine.

US Patent:

60687320, May 30, 2000

Filed:

Jan 22, 1999

Appl. No.:

9/235244

Inventors:

Robert F. Cassidy - Warwick NY
Anant D. Mahale - Chester NY
Dennis J. Kerstanski - Warwick NY
Robert V. Mahony - Greenwood Lake NY

Assignee:

International Paper Company - Purchase NY

International Classification:

D21F 1104

US Classification:

162123

Abstract:

Stiffness improvements for multi-ply paperboard laid from chemically pulped softwood and hardwood papermaking furnish are obtained by fiber fractionating the softwood pulp and repositioning the resulting fractions. Chemically pulped and preferably bleached softwood fiber "rejects" of a fractionation screen are redistributed into the outer plies of a three-ply, 300-350 g/m (approximately 195 #/3,000 ft. ) basis weight paperboard. The fractionation "accepts" are repositioned to the center ply for a 12% to 15% increase in Taber stiffness. The short, "accept" fiber from the fractionation screen is mixed with chemically pulped hardwood fiber or modified mechanical pulp of either species for formation of the center ply on a multiformer paper machine.