US PATENT SUBCLASS 523 / 340
.~.~ Removing material at reduced pressure, e.g., flashing, sublimation, spray drying, etc.

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


523 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF {71}
340.~.~ Removing material at reduced pressure, e.g., flashing, sublimation, spray drying, etc. {1}
342  DF  .~.~.~> With step of spraying or centrifuging

DEFINITION

Classification: 523/340

Removing material at reduced pressure, e.g., flashing, sublimination, spray drying, etc.:

(under subclass 1) Process of treating or forming an intentional or desired composition wherein material is removed at reduced pressure, e.g., flashing, sublimation, etc., to yield a product which is an intentional or desired composition.

(1) Note. Use of the term "stripping" is presumed to indicate removal of materials under vacuum unless there are other factors disclosed which permit another inference.

(2) Note. This subclass includes both vacuum distillation or evaporation.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids, for processes of vacuum freeze drying.

528, Synthetic Resins or Natural Rubbers,

480+, for polymer purification by vacuum stripping, flashing, or sublimation.