Method for producing crystal polymorphs and crystal...

Details Method for producing crystal polymorphs and crystal... Method for producing crystal polymorphs and crystal...

2006-10-17

2006-10-17

Russel, Jeffrey Edwin (Department: 1654)

Chemistry: natural resins or derivatives; peptides or proteins;

Proteins, i.e., more than 100 amino acid residues

Separation or purification

C023S29500G, C204S157150, C204S157410, C204S157610, C204S157680, C204S157690, C204S157750, C204S157820, C204S157870, C204S157900, C204S158140, C530S427000, C562S575000

Reexamination Certificate

active

07122642

ABSTRACT:
A method to prepare new or unexpected polymorphs of materials which have not been observed, or to obtain a known polymorph under different conditions than those in which it is usually made, by using a laser to cause nucleation and crystal growth to occur in a supersaturated solution in such a way as to obtain a crystal structure which would not normally appear without the use of the laser.

REFERENCES:
patent: 5976325 (1999-11-01), Blanks
patent: 6426406 (2002-07-01), Myerson et al.
patent: 6596077 (2003-07-01), Myerson
patent: 2003/0024470 (2003-02-01), Myerson
patent: 2003/0044433 (2003-03-01), Werling et al.
patent: 2003/0101926 (2003-06-01), Myerson
Zaccaro et al. Nonphotochemical, Laser-Induced Nucleation of Sueprsaturated Aqueous Glycine Produces Unexpected gamma-Polymorph. Crystal Growth & Design. vol. 1, No. 1, pp. 5-8 (Nov. 1, 2000).
The Merck Index, Eleventh Ed. Rahway: Merck & Co., Inc., pp. 57, 1553 (1989).
Garetz et al., Nonphotochemical, Polarization-Dependent Laser-Induced Nucleation in Supersaturated Aqueous Urea Solutions, Physical Review Letters, vol. 77, No. 16, pp. 3475-3476 (Oct. 14, 1996).

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