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Tamper evident food package
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Patent number 4,488,658
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Issue date Dec 18, 1984
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Sealright Co, Inc.
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Ernest L. Smith
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Tamper-evident closure
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Patent number 4,487,329
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Issue date Dec 11, 1984
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Maryland Cup Corporation
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Thomas W. Winstead
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3189214
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Patent number 3,189,214
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Issue date Jun 15, 1965
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL