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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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US Patent 4957730 - Antimycotic nail varnish
US Patent Issued on September 18, 1990
Estimated Patent Expiration Date:
September 18, 2007Estimated 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.
Estimated Patent Expiration Date:
September 18, 2007Estimated 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.AbstractA nail varnish comprising a water-insoluble film-forming substance and an antimycotic compound which is a 1-hydroxy-2-pyridone I of the general formula ##STR1## in which R1 is a hydrocarbon group which contains from 6 to 9 carbon atoms, but is free from olefinic and acetylenic bonds, one of the groups R2 and R4 is hydrogen and the other is hydrogen, methyl or ethyl and R3 is alkyl having up to two carbon atoms, said antimycotic ingredient being present in free form or in the form of a salt.Other References
| InventorsApplicationNo. 942699 filed on 12/17/1986US Classes:424/61, MANICURE OR PEDICURE COMPOSITIONS514/345, Chalcogen bonded directly to ring carbon of the six-membered hetero ring546/290Chalcogen bonded directly to ring carbon of the six-membered hetero ringField of Search424/61, MANICURE OR PEDICURE COMPOSITIONS546/290, Chalcogen bonded directly to ring carbon of the six-membered hetero ring514/345Chalcogen bonded directly to ring carbon of the six-membered hetero ringExaminersPrimary: Rollins, John W.Assistant: Catchpole, W. Attorney, Agent or FirmUS Patent References2752356, 3269904, 3883545, 3968118, Process for the manufacture of 1-hydroxy-2-pyridonesIssued on: 07/06/1976 Inventor: Lohaus , et al.4185106, Pyridones as antidandruff agents Issued on: 01/22/1980 Inventor: Dittmar , et al.4250164Method of treating psoriasis of the nails and composition Issued on: 02/10/1981 Inventor: Bernstein Foreign Patent References
International ClassA61K 007/043Foreign Application Priority Data1985-12-19 DE |
