U.S. patents available from 1976 to present.
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...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.

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Class 549/472 - Plural hetero rings


Subclass of Class 549 - Organic compounds -- part of the class 532-570 series
Definition: Compounds wherein at least two hetero rings, which may be
No. of patents: 251
Last issue date: 01/10/2012


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NumberTitleIssue Date
3952024Furfurylthioacetone
The chemical compound furfurylthioacetone which is useful as a flavor additive for foodstuffs and beverages....
04/20/1976
39520265-Methyl-furfuryl furfuryl ether
The compound 5-methyl-furfuryl furfuryl ether which is useful as a flavor additive for foodstuffs and beverages....
04/20/1976
3950565Flavoring foods
Addition compounds of 2- or 5-monoalkyl and 2,5-dialkyl-4-hydroxy-2,3-dihydrofuran-3-ones and C2 -C9 carbonyl compounds are provided. These addition compounds are useful to impart improved flavouring properties to foodstuffs....
04/13/1976
3945999Process for preparing solid bis-(4-furfurylidenamino-phenyl)-methane
Bis-(4-furfurylidenamino-phenyl)-methane, m.p. 90°-91°C., is made by reacting furfural with bis-(4-aminophenyl)-methane in diethyl ether. It is useful in photography....
03/23/1976
3940502Flavoring agent
The enchancement of foodstuffs is effected by the addition of a small but effective flavor-modifying amount of a compound having the general formula ##SPC1## Wherein R1 and R2 are hydrogen, alkyl, eg. methyl, ethyl; aryl; e.g. phenyl...
02/24/1976
3939204Radioactive functional diagnostic agents
This invention relates to triiodized dicarboxylic acid anilides containing radioactive iodine of the formula ##SPC1## Wherein R1 is hydrogen, carboxyl, N-acylamino, N-acylaminomethyl, N-alkyl-N-acylamino, N-butyrolactamyl, or an ##EQU1## ...
02/17/1976
39339063,4-Bisamino-5-sulfamoylbenzoic acids
3-Amino-4-anilino-5-sulfamoylbenzoic acids, e.g. those of the formula ##SPC1## R = an aliphatic or araliphatic radical R' = h, alkyl, or aminophenyl Alkyl esters or salts thereof are diuretic agents....
01/20/1976
3931250Heterocyclic compound as odor- and flavor-modifying agent
New heterocyclic compound useful as odor-modifying agent for manufacturing perfumes, perfumed products, natural or synthetic essential oils, and as flavor-modifying agent for the manufacture of artificial flavors or for flavoring foodstuffs, animal feeds,...
01/06/1976
393129710-Hydroxy PGC compounds
10.alpha.-Hydroxy-11-desoxy-prostaglandin analogs of the PGE.sub.1 and PGE.sub.2 and PGF.sub.1.sub..alpha. and PGF.sub.2.sub..alpha. series, the 11-dehydro derivatives thereof as well as the 9,10-ketals in the PGF series, and methods of preparing same, ...
01/06/1976
3931246Flavoring agents
Furan Sulfur compounds of the formula ##SPC1## Wherein when n is 0, R.sub.1 and R.sub.2 are methyl; when n is 1, R.sub.1 and R.sub.2 are methyl or R.sub.1 is hydrogen and R.sub.2 is 5-methylfuryl; and when n is 2, R.sub.1 and R.sub.2 are hydrogen which ar...
01/06/1976
3931245Flavoring agent
Furan Sulfur compounds of the formula ##SPC1## Wherein n is 1 and R is methyl, ethyl, propyl, 1-methyl-prop-1-en-1-yl, 2-methyl-prop-1-en-1-yl, furyl or hydrogen; and wherein n is 2 and R is methyl which are useful as flavor additives for foodstuffs and b...
01/06/1976
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