Invention Grant
US4438249A Biodegradable polyurethane urea acyl semicarbazides for the manufacture
of biodegradable alloimplants
失效
可生物降解的聚氨酯脲酰基氨基脲，用于生产可降解异构体
- Patent Title: Biodegradable polyurethane urea acyl semicarbazides for the manufacture of biodegradable alloimplants
- Patent Title (中): 可生物降解的聚氨酯脲酰基氨基脲，用于生产可降解异构体
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Application No.: US362429Application Date: 1982-03-26
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Publication No.: US4438249APublication Date: 1984-03-20
- Inventor: Tatyana E. Lipatova , Dmitry V. Vasiichenko , Georgy A. Pkhakadze , Xenya L. Konoplitskaya
- Applicant: Tatyana E. Lipatova , Dmitry V. Vasiichenko , Georgy A. Pkhakadze , Xenya L. Konoplitskaya
- Assignee: Lipatova Tatyana E,Vasiichenko Dmitry V,Pkhakadze Georgy A,Konoplitskaya Xenya L
- Current Assignee: Lipatova Tatyana E,Vasiichenko Dmitry V,Pkhakadze Georgy A,Konoplitskaya Xenya L
- Main IPC: A61L27/18
- IPC: A61L27/18 ; C08G18/10 ; C08G18/38
Abstract:
Polyurethane urea acyl semicarbazides for preparing biodegradable alloimplants having the general formula: (--NH--R.sub.1 --CONHNHCONH--R.sub.2 --NHCO--O--R.sub.3 --CONH--R.sub.2 --NH--CO--).sub.n where n=5-24; R.sub.1 is selected from the group consisting of ##STR1## R.sub.2 is selected from the group consisting of --(CH.sub.2).sub.6 --, --C.sub.6 H.sub.4 -- CH.sub.2 -- C.sub.6 H.sub.4.sup.- ; R.sub.3 is selected from the group consisting of --(CH.sub.2).sub.4 --O--.sub.14, --(CH.sub.2).sub.4 --O--.sub.21.
Public/Granted literature
- US5874367A Method of treating a semi-conductor wafer Public/Granted day:1999-02-23
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