David A Nowak

US Patent:

50062654, Apr 9, 1991

Filed:

May 25, 1989

Appl. No.:

7/357457

Inventors:

Kishore K. Kar - Midland MI
David J. Nowak - Auburn MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B01D 2500

US Classification:

210741

Abstract:

The invention is a filter apparatus and method for separating suspended solids from fluids, particularly liquids. A filter chamber is defined inside a filter housing. Inside the chamber is a filter bundle, consisting of two or more filter screens, of a non-woven construction. Spaces between the filter screen strands provide channels for fluid to flow through the filter bundle along a tortuous path that is parallel to each screen. These spaces also define openings for directing a flushing fluid, such as air, in a crosswise direction through the filter screens. The crossflow path of the flushing fluid removes solid particles trapped in the channels of the filter screens.

US Patent:

49476793, Aug 14, 1990

Filed:

Apr 21, 1989

Appl. No.:

7/341465

Inventors:

Robert L. McGee - Midland MI
David J. Nowak - Auburn MI
Gordon D. McCann - Midland MI
Frank L. Saunders - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

G01N 1110

US Classification:

73 641

Abstract:

The specification discloses a method and apparatus for determining the gel time of thermoset resins by using a disposable vial, a disposable spindle for insertion into the vial, a locking collar releasably secured to the disposable vial for mounting the vial in a permanent sample cup and holding it against rotation with respect thereto, and a spindle adaptor releasably receiving the disposable spindle for mounting same to the spindle mount of a conventional viscometer. The thermoset resin is located in the disposable vial along with the disposable spindle. The permanent sample cup including the disposable vial and its contents is located in a heater and the spindle adaptor is secured to the spindle mount of the viscometer. The viscometer is operated and the gel time is determined as the length of time it takes until the viscosity of the heated resin sample begins to increase sharply.