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In Criminal Law, an agreement between two or more people to act jointly for an unlawful purpose; a conspiracy. In patent law, the joining together of several separate inventions to produce a new invention.

An illegal combination in restraint of trade, defined under the Sherman Anti-Trust Act, is one in which the conspirators agree expressly or impliedly to use devices such as price-fixing agreements to eliminate competition in a certain locality, e.g., when a group of furniture manufacturers refuse to deliver goods to stores that sell their goods for under a certain price.

In patent law a combination is distinguishable from an aggregation in that it is a joint operation of elements that produces a new result as opposed to a mere grouping together of old elements. This is important in determining whether or not something is patentable, since no valid patent can extend to an aggregation.

West's Encyclopedia of American Law, edition 2. Copyright 2008 The Gale Group, Inc. All rights reserved.

COMBINATION. A union of different things. A patent may be taken out for a new combination of existing machinery, or machines. See 2 Mason, 112; and Composition of matter.
     2. By combination is understood, in a bad sense, a union of men for the purpose of violating the law.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Sun, Upper bounds for the rainbow connection number of line graphs, Graphs & Combin. (28) 2012, 251-263.
Lih, Structure properties and edge choosability of planar graphs without 6-cycles, Combin. Probab.
Miller, On d-antimagic labelings of prisms, Ars Combin.,72, 65-76 (2004).
Pikhurko, Results and open problems on minimum saturated hypergraphs, Ars Combin. 72 (2004), 111-127.
Combin. 12 (2005) research paper R9; 54 pages (electronic).
Combin. Theory, Series A 115, Issue 5, (2008), 693-725.
Mathematics of Ramsey Theory, Springer, Berlin, Alorithms and Combin. 5 (1990), 34-45.
Combin., 16(2, Special volume in honor of Anders Bjorner):Research Paper 9, 24, 2009.
finds the combinatorial structure to reconstruct or generalize classical mathematics, or combines different mathematical sciences and establishes a new enveloping theory on topological graphs for hold the reality of things F.