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While cross-linked polyacrylamide has been used in food products and baby diapers for many years, we routinely field questions about safety and proper handling. Since safety issues and our customer's peace of mind are paramount, we commissioned this updated MSDS by Marty LaBenz, a noted chemist and regulatory affairs specialist.

Castle International Resources - Material Safety Data Sheet - 10 March 1999.

4 October 1999

Let me introduce myself. My name is Dale Greenwood, I am the president of Castle International Resources, and I've owned and operated this website since its inception over two years ago. Dan's will expressed his intent that I continue his efforts in the polymer business.

I have actively worked in the research & development of cross-linked polyacrylamide in agriculture for over a decade. The use of landscape fabric with polymer was my invention. I built Dan's computers, set-up and operated the original electronic bulletin board (pre-Internet), set-up and operated this website, and handled the technical details of Dan's communications systems until his untimely death last year.

I've just discovered the use of the Hydrosource trademark / service mark in this website may be problematic. According to the U.S Patent and Trademark office (USPTO), the federal trademark for the name Hydrosource was first applied for and granted to Hydrosource, Inc. out of Beaverton Oregon, a company that makes water purifiers. According to the USPTO, the Colorado corporation, Western Polyacrylamide, Inc. later applied for and was granted a 'service mark' (not a trademark) for the same name, Hydrosource. This service mark was recently (Jan. of 1999) renewed with the USPTO in the name of Western Polyacrylamide, Inc., a Colorado corporation. The Colorado Secretary of State's office has provided me documentation showing Dan allowed the original Colorado corporation charter for Western Polyacrylamide Inc. to lapse years ago. Crazy, huh?

On the anniversary of Dan's passing, I've decided to discontinue development of this original "Hydrosource" website. Beyond the issue of the ownership and/or control of the Hydrosource trademark / service mark, here are the factors that figure into this decision:

Therefore, all library materials co-authored, published and edited by me will soon be transferred to my corporate website (Castle International Resources - www.castlekeep.com), as there is no sense in spending time and money maintaining separate websites. This does not mean we are 'getting out of the cross-linked polyacrylamide business.' - Far from it:


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Revised: February 23, 2007.