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Novel rhodamine dyesRelated Patent Categories: Organic Compounds -- Part Of The Class 532-570 Series, Azo Compounds Containing Formaldehyde Reaction Product As The Coupling Component, Carbohydrates Or Derivatives, Hetero Ring Is Six-membered Consisting Of One Nitrogen And Five Carbons, Spiro, The Spiro Includes The Six-membered Hetero RingNovel rhodamine dyes description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060293523, Novel rhodamine dyes. Brief Patent Description - Full Patent Description - Patent Application Claims
REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of priority of provisional patent applications Ser. Nos. 60/680,088 and 60/680,212, both filed May 12, 2005, the contents of which are incorporated herein by reference in their entireties. [0002] This application is related to the following commonly assigned, United States patent applications and patents, the contents of which are incorporated herein by reference in their entireties: [0003] U.S. Pat. No. 6,801,233 B2; [0004] U.S. Pat. No. 6,906,735 B2; [0005] U.S. Pat. No. 6,951,952 B2; [0006] U.S. Pat. No. 7,008,759 B2; [0007] U.S. patent application Ser. No. 10/806,749, filed Mar. 23, 2004, which is a division of U.S. Pat. No. 6,801,233 B2; [0008] United States Patent Application Publication No. US2004/0176248 A1; (Attorney docket No. A-8544AFP); [0009] United States Patent Application Publication No. US2004/0204317 A1; (Attorney Docket No. A-8586AFP); [0010] United States Patent Application Publication No. US2004/0171817 A1; (Attorney Docket No. A-8589AFP); [0011] U.S. patent application Ser. No. 11/400,735; filed on Apr. 6, 2006 (Attorney Docket No. A-8598); [0012] U.S. patent application Ser. No. 11/400,734; filed on Apr. 6, 2006 (Attorney Docket No. A-8606); and [0013] U.S. patent application Ser. No. (______; filed on even date herewith, Express Mail No.: EV 669114278 US (Attorney Docket No. A-8608). FIELD OF THE INVENTION [0014] This invention relates to novel rhodamine color-forming materials and, more particularly, to such color-forming materials that exhibit one color in a crystalline form and a second, different color in an amorphous form. BACKGROUND OF THE INVENTION [0015] The development of thermal print heads (linear arrays of individually-addressable heating elements) has led to the development of a wide variety of thermally-sensitive imaging materials. In some of these, known as "thermal transfer" systems, heat is used to move colored material from a donor sheet to a receiver sheet. Alternatively, heat may be used to convert a colorless coating on a single sheet into a colored image, in a process known as "direct thermal" imaging. Direct thermal imaging has the advantage over thermal transfer of the simplicity of a single sheet. On the other hand, unless a fixing step is incorporated, direct thermal systems are still sensitive to heat after thermal printing. If a stable image is needed from an unfixed direct thermal system, the temperature for coloration must be higher than any temperature that the image is likely to encounter during normal use. A problem arises in that the higher the temperature for coloration, the less sensitive the imaging member will be when printed with the thermal print head. High sensitivity is important for maximum speed of printing, for maximizing the longevity of the print head, and for energy conservation in mobile, battery-powered printers. As described in more detail below, maximizing sensitivity while maintaining stability is more easily achieved if the temperature of coloration of a direct thermal medium is substantially independent of the heating time. [0016] Known in the art are direct thermal imaging systems wherein an image is formed directly in the imaging member and thermal transfer thermal imaging systems wherein image-forming material is transferred, by the application of thermal energy, from a donor member to an image-receiving member. Various mechanisms to achieve image formation have been described in the thermal imaging art. [0017] U.S. patent application Ser. No. 10/789,648, filed Feb. 27, 2004 (United States Patent Application Publication No. US2004/0176248 A1; Attorney Docket No. A-8544AFP), and assigned to the same assignee as the present application, is directed to a thermal imaging method wherein a dye is converted from one form in which the dye has one color to another form in which the dye has a second color, e.g., from colorless to colored. [0018] Japanese Patent No. JP1997241553 discloses an ink jet recording liquid which includes asymmetrical rhodamine dyes. U.S. Pat. No. 4,390,616 discloses thermal imaging members and methods utilizing certain rhodamine dyes. [0019] As the state of the imaging art advances and efforts are made to provide new imaging systems that can meet new performance requirements, and to reduce or eliminate some of the undesirable characteristics of the known systems, it would be advantageous to have new dyes which are suitable for use in imaging systems as well as in other applications. SUMMARY OF THE INVENTION [0020] It is therefore an object of this invention to provide novel rhodamine dyes. Continue reading about Novel rhodamine dyes... Full patent description for Novel rhodamine dyes Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Novel rhodamine dyes patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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