Patent 4331654 Issued on May 25, 1982. Estimated Expiration Date: June 13, 2000. 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.
424/450, Liposomes252/62.53, With wax, bitumen, resin, or gum424/490, Coated (e.g., microcapsules)514/78, Lecithins600/12Magnetic element placed within body (e.g., injected, inserted, implanted, etc.)