Eric A Swenson

US Patent:

6063894, May 16, 2000

Filed:

Oct 9, 1998

Appl. No.:

9/168985

Inventors:

Lloyd Myles Phipps - Shelton WA
Eric J. Swenson - Olympia WA

Assignee:

Advanced Polymer Technologies, L.L.C. - Cambridge MA

International Classification:

C08G 6400

US Classification:

528196

Abstract:

A process for purifying a substantially unoriented polymer containing an impurity by means of ultrasonic leaching or extraction is described. The process involves contacting a substantially unoriented polymer containing an impurity with a cavitatable liquid, subjecting the substantially unoriented polymer containing an impurity in contact with a cavitatable liquid to ultrasonic radiation at a frequency and intensity sufficient to extract the impurity from the substantially unoriented polymer to form a purified substantially unoriented polymer, and then separating the purified substantially unoriented polymer from the cavitatable liquid containing the extracted impurity. A purified substantially unoriented polymer prepared by such a method is also described.

US Patent:

6316518, Nov 13, 2001

Filed:

Feb 3, 2000

Appl. No.:

9/497701

Inventors:

L. Myles Phipps - Shelton WA
Eric J. Swenson - Olympia WA

Assignee:

Advanced Polymer Technology, Inc. - Shelton WA

International Classification:

C08F 246

US Classification:

522151

Abstract:

The invention includes a method of increasing polymerization within a condensation polymer. A substantially dry condensation polymer material is provided. The material is exposed to radiation having a frequency less than microwave frequency for a time of at least about 0. 5 hour to increase an amount of polymerization within the material. The invention also includes a method of treating a polyamide material. A polymeric polyamide material is provided and exposed to first radiation having a first power intensity. The material is then exposed to second radiation having a second power intensity. The first power intensity is higher than the second power intensity. Additionally, the invention includes an apparatus. The apparatus includes an inlet port through which a feed material enters the apparatus, and an outlet port through which the feed material passes out of the apparatus. The apparatus further includes a feed material flow path from the inlet port to the outlet port, The flow path comprises at least two radio-frequency radiation reaction zones which comprise different power intensities of radio-frequency radiation relative to one another.