| |
| This is U. S. Patent 4000998 |
|
Spontaneously-formed nepheline-carnegieite glass-ceramics
The instant invention relates to the manufacture of articles demonstrating the physical properties and internal microstructure of glass-ceramic bodies but which can be formed spontaneously from molten glass. Thus, the heat treatment of a precursor glass body, such as is required in the production of conventional glass-ceramic articles to cause the crystallization in situ thereof, is avoided. More particularly, this invention relates to the manufacture of highly crystalline glass-ceramic articles having compositions within the Na.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 field, wherein carnegieite and/or nepheline solid solution crystals constitute the predominant crystal phase, which can be formed spontaneously from a molten glass batch. Description U.S. applications Ser. Nos. 559,725 and 559,787, filed concurrently herewith by David G. Grossman, and U.S. aplication Ser. No. 559,732, filed concurrently herewith by J. E. Flannery and D. R. Wexell, disclose the production of spontaneously formed glass-ceramic articles wherein a fluormica comprises the primary crystal phase. U.S. applications Ser. Nos. 559,726, 559,789, and 559,727, also filed concurrently herewith by David G. Grossman, disclose the production of spontaneously formed glass-ceramic articles wherein celsian, mullite, and beta-spodumene solid solution, respectively, constitutes the predominant crystal phase. U.S. application Ser. No. 559,786, filed concurrently herewith by George H. Beall, discloses the manufacture of spontaneously formed glass-ceramic articles wherein alpha-quartz solid solution constitutes the predominant crystal phase. U.S. application Ser. No. 559,788, also filed concurrently herewith by G. H. Beall, P. E. Balszyk, and W. T. Brydges, III, describes the manufacture of spontaneously formed glass-ceramic articles wherein beta-spodumene solid solution constitutes the principal crystal phase. Finally, U.S. Application Ser. No. 559,731, filed concurrently herewith by the present applicant, discusses the production of spontaneously formed glass-ceramic articles wherein BaO and/or SrO-Fe.sub.2 O.sub.3 -SiO.sub.2 solid solution comprises the predominant crystal phase. | U. S. Patent Attorneys Dunlap, Grubb & Weaver, P.C. 1200 G Street NW, Suite 800, Washington, District of Columbia 20005 U.S.A. "Innovative Lawyers for Innovative Businesses" Cahn & Samuels, LLP 1100 17th Street, NW, Suite 401, Washington, District of Columbia 20036 U.S.A. Attorney at Law Christopher & Weisberg, P.A. 1455 Pennsylvania Avenue, N.W., Suite 100, Washington, District of Columbia 20004 U.S.A. Attorneys at Law Manelli Denison & Selter PLLC 2000 M Street, N.W. Suite 700, Washington, District of Columbia 20036-3307 U.S.A. Attorneys at Law Greenberg & Lieberman, LLC 2141 Wisconsin Avenue, N.W., Suite C-2, Washington, District of Columbia 20007 U.S.A. Patents, Trademarks, copyrights computer Law, Licensing for inventors and businesses locally, nation wide and internationally. Mauro Law Offices, P.C. 1020 Nineteenth Street, N.W., Suite 400, Washington, District of Columbia 20036 U.S.A. Complex Litigation, Intellectual Property, Trademark, Patent Litigation with DC Volume only Clark & Brody 1090 Vermont Avenue, NW, Suite 250, Washington, District of Columbia 20005 U.S.A. Attorneys at Law Jacobson Holman PLLC 400 Seventh Street, N.W., Washington, District of Columbia 20004 U.S.A. Attorneys at Law Browdy and Neimark, P.L.L.C. Suite 300, 624 Ninth Street, N.W., Washington, District of Columbia 20001-5303 U.S.A. Intellectual Property Law Stevens Davis Miller & Mosher, L.L.P. 1615 L Street, N.W. Suite 850, Washington, District of Columbia 20036 U.S.A. Attorneys at Law Kubovcik & Kubovcik 900 17th Street, N.W., Suite 710, Washington, District of Columbia 20006 U.S.A. "Intellectual Property Law" Adduci, Mastriani & Schaumberg, L.L.P. 1200 Seventeenth Street, N.W., Fifth Floor, Washington, District of Columbia 20036-3006 U.S.A. International Trade, Customs, Intellectual Property, Litigation-Successful, Experienced, Specialized Artabane & Belden, P.C. 818 18th Street, N.W., Suite 410, Washington, District of Columbia 20006 U.S.A. Hall & Vande Sande, LLC Serving Washington, District of Columbia Attorneys at Law Epstein & Gerken Serving Washington, District of Columbia Patent, Trademark, Copyright & Intellectual Property Law. Robert N. Levin, P.C. Serving Washington, District of Columbia Attorney At Law John Gibson Semmes Serving Washington, District of Columbia Attorney at Law Kramer & Amado, P.C. Serving Washington, District of Columbia Domestic and International Patent, Trademark, Copyright, Unfair Competition and Related Matters. Patrick Henry LLP Serving Washington, District of Columbia Serving our Clients Effectively and Efficiently in the Washington Metropolitan Area Roberts Mlotkowski & Hobbes PC Serving Washington, District of Columbia Attorneys At Law Jagtiani + Guttag Serving Washington, District of Columbia Attorneys at Law Law Office of William C. Wood, LLC Serving Washington, District of Columbia Practice focus on Family, Criminal and Civil Law matters; also Registered Patent Attorney. Litman Law Offices, Ltd. Serving Washington, District of Columbia Attorney at Law Bancroft Associates PLLC 1919 M Street, NW, Suite 470, Washington, District of Columbia 20036 U.S.A. Attorneys at Law Farr & Taranto 1220 19th Street, N.W., Washington, District of Columbia 20036-2435 U.S.A. Attorneys at Law | ||