Superparamagnetic wax compositions useful in magnetic levitation separations
Patent 4025448 Issued on May 24, 1977. Estimated Expiration Date: 
May 24, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 24, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 05/645039 filed on 12/29/1975US Classes:252/60, PHYSICAL SEPARATION AGENTS106/272, With filler, dye or pigment106/31.62, Petroleum derivative containing (e.g., paraffin or microcrystalline wax, etc.)106/31.63, Natural wax containing (e.g., carnauba, montan, Japan, candelilla, etc.)106/31.64, Erasable, purified, correctable, fugitive, indicator, conductive, fluorescent, chromogenic, or magnetic composition209/1, MISCELLANEOUS252/62.51R, MAGNETIC252/62.52, Flaw detection or magnetic clutch252/62.53With wax, bitumen, resin, or gumExaminersPrimary: Weinblatt, MayerAssistant: Smith, John D. Attorney, Agent or FirmAbstractSuperparamagnetic wax compositions useful in magnetic levitation separations of particle mixture based on density differences are provided which have the ability to withstand without phase separation repeated melt-freeze cycling. The stability is obtained by using a mixture of hydrocarbon and oxygenated waxes.Other References
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