Neither the corporation nor its products would be protected by copyright. They do, however, control a number of trademarks.
Same as copyright notice for anything else: Copyright, or copr. or circle-C, the date of copyright and the author or other copyright owner's name. E.g., "Copyright 2012 Walt Disney Productions, Inc."
Armour Swift-Eckrich Inc. is owned by ConAgra
You would cite the date by reproducing the copyright notice. In the United States, a copyright notice consists of three elements:: 1. the © symbol (in some cases (c) is substituted), the word "Copyright" or abbreviation "Copr."; 2. the first year of publication; and 3. the owner of the copyright, either by name, abbreviation, or other designation. A practical example would be... © 2009 EndTrans Netwide Productions Inc. I don't know... That's why I went to this site...
Muppets, Inc.
Marvel Comics, Inc.
copyright 1962 by Regent Music Corporation. copyright renewed by Jewel Music Publishing Co. Inc.
Mattel Inc has not and never had copyrighted Harry Potter.
The first edition is Copyright 1968 by Doubleday & Company, Inc. of Garden City, NY. A second edition co-authored by Joseph M. Crowley was published in December, 1997, by Laplacian Press (ISBN 1885540043).
2008 Wimpy Kid, Inc.
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No, Armor Swift-Eckrich Inc. is not owned by ConAgra. It is currently owned by a Brazilian company called JBS S.A.
The legal copyright claimant is Feminine Touch, Inc.; this, in turn, appears to be Conrad and Maria Janis, personally.