US PATENT SUBCLASS 530 / 219-- .~.~ Sulfur, selenium, or tellurium containing material used in the process, or product thereof (e.g., disproportionation of rosin, etc.)

US PATENT SUBCLASS 530 / 219
.~.~ Sulfur, selenium, or tellurium containing material used in the process, or product thereof (e.g., disproportionation of rosin, etc.)

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

Internet Version by PATENTEC © 1999 Terms of Use

530 /	HD	CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF

200	DF	NATURAL RESINS OR DERIVATIVES (E.G., WOOD OR PINE TAR; CATIVO RESIN DERIVATIVES, ETC.) {6}
210	DF	.~ Rosin or derivative used as starting material in process, or product thereof (e.g., using gum rosin, wood rosin, solid tall oil rosin, etc.) {10}
219		.~.~ Sulfur, selenium, or tellurium containing material used in the process, or product thereof (e.g., disproportionation of rosin, etc.) {1}
220	DF	.~.~.~> The sulfur, selenium, or tellurium containing material is inorganic

DEFINITION

Classification: 530/219

(under subclass 210) Processes wherein there is utilized a material containing sulfur, selenium or tellurium, or products of such processes.

(1) Note. Many patents in this subclass are directed to the disproportionation reaction involving an intra and inter-molecular rearrangement of the hydrogen atoms in the rosin acids to convert them into acids which lack nonbenzenoid double bond conjugation and are therefore more stable to oxidation than abietic acid. Dehydroabietic acid, one of the principal products of disproportionation, contains one aromatic ring in the hydrophenanthrene nucleus.