Document M4691ZakVKD154jBmJBGQvQbM

cOH tu-4878 <WW> ESTABUSHEQ 1802 E. 1. d u Po n t d e Ne mo u r s & Co mp a n y INCORPORATED Wil min g t o n , De l a w a r e 19898 LEGAL DEPARTMENT AIRMAIL July 18, 1988 Uhthoff, Gomez Vega & Apartado Postal (P.0. 06000 Mexico, D.F. Mexico Uhthoff, S. Box) M-2059 C. Gentlemen: Mexican Pat. appln. No. 192468 Your Ref.: 363-P Our Ref.: CH-1175 Coombe In response to your letter of 25 May 1988 regarding this application, I have amended Claim 1 as the Examiner has requested. Note that I have not revised the "means" phases in the preamble of the claims because they are not used to describe the inventive concept of this invention. I believe that the above will allow you to prepare a response to the Examiner. Please let me Know, however, if you need anything else from me. DJG/adwpjjjr CHECKED Very truly yours, 0$ David J. Gould JUL2 2 1988 N36760 DU P0 50302029 1. In a fluid energy mill of the confined vortex type for comminuting pulverulent solids having in combination a disc-shaped chamber defined by a pair of opposing circular-shaped axial walls and a peripheral wall, a multiplicity of inlets extending through the peripheral wall and aligned for directing gaseous fluid into the chamber tangentially to a circle whose radius is smaller than the radius, R, of the chamber, means for charging pulverulent solids to the chamber at the peripheral wall and discharge means for withdrawing pulverulent solids and gaseous fluid along the axis of the chamber, the improvement wherein the fluid energy mill is provided with a measurement instrument to sense the differential pressure between the discharge and feed of the mill through openings in the chamber peripheral wall and in the discharge means each opening provided with a purging system to prevent pluggage. N36760.01 DU P 050302030 2 as otherwise the application will be officially considered as abandoned. Please consider the situation with the urgency and importance that the case deserves and let us know well in advance to the expiration date your instructions, for which preparation we offer our following comments: 1. Words such as "means", "device", "member" etc., are usually objected by the examiners on the grounds of ambiguousness. Present claim 1 is disclosing charging means, discharge means and means for purging, thus in order to comply with the above requirements, please provide us with the technical terms used in this type of mill. In absence of your instructions, we will apply for a two months extension period. Very truly yours, UHTHOFF, GOMEZ VEGA & UHTHOFF S.C. 2nd Air Mail Enc. Debit Note No. MA*cps Marisela Arphundia Acevedo Technical Department. 140771 N36760.02 DUP050302031