David M Bryant

US Patent:

20040087754, May 6, 2004

Filed:

Oct 31, 2002

Appl. No.:

10/284993

Inventors:

Paul Foley - Midland MI, US
John Argyropoulos - Scott Depot WV, US
David Bryant - South Charleston WV, US
Debkumar Bhattacharjee - Lake Jakson TX, US
Aisa Sendijarevic - Troy MI, US

International Classification:

C08G018/00
C08G018/10

US Classification:

528/059000, 528/065000, 528/066000

Abstract:

This invention relates to polyurethane compounds, e.g., elastomers, which are the reaction product of a cycloaliphatic diisocyanate, a polyol and a chain extender. The cycloaliphatic diisocyanate comprises (i) trans-1,4-bis(isocyanatomethyl)cyclohexane or (ii) an isomeric mixture of two or more of cis-1,3-bis(isocyanatomethyl)cyclohexane, trans-1,3-bis(isocyanatomethyl)cyclohexane, cis-1,4-bis(isocyanatomethyl)cyclohexane and trans-1,4-bis(isocyanatomethyl)cyclohexane, provided the isomeric mixture comprises at least about 5 weight percent of said trans-1,4-bis(isocyanatomethyl)cyclohexane. This invention also relates to shaped and molded articles prepared from said polyurethane compounds.

US Patent:

57628106, Jun 9, 1998

Filed:

Nov 22, 1996

Appl. No.:

8/755397

Inventors:

Paul Pelton - Winston Salem NC
David A. Bryant - King NC

International Classification:

C02F 140

US Classification:

210799

Abstract:

A coalescing oil/water separator for removing free and dispersed oil from a wastewater stream with increased separation efficiency and producing a substantially oil-free effluent. The coalescing oil/water separator is self-contained in a tank shell and includes an improved oil coalescing medium for separating oil out of wastewater and a series of baffles and weirs to direct flow, skim the separated oil and control the liquid level in the separator. The improved oil coalescing medium is uniquely designed and sized to maximize the coalescing surface area in and the flow rate through a given volume of medium by including a plurality of molded, stackable perforated sheets or plates having an oleophilic surface and increased coalescing surface area for inducing impingement of oil droplets on the medium surface. Each stackable sheet includes a plurality of openings and recesses which are aligned and positioned to form numerous, closely spaced vertical and horizontal communicating passages for maximizing the flow rate of wastewater while simultaneously maximizing the coalescing surface area of the medium.