Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Reexamination Certificate
2008-07-29
2008-07-29
Truong, Duc (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
C528S495000, C528S50200C, C528S425000, C528S271000, C424S193100, C424S194100
Reexamination Certificate
active
07405266
ABSTRACT:
The invention provides a sterically hindered polymer that comprises a water-soluble and non-peptidic polymer backbone having at least one terminus covalently bonded to an alkanoic acid or alkanoic acid derivative, wherein the carbon adjacent to the carbonyl group of the acid or acid derivative group has an alkyl or aryl group pendent thereto. The steric effects of the alkyl or aryl group allow greater control of the hydrolytic stability of polymer derivatives. The polymer backbone may be poly(ethylene glycol).
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Bentley Michael David
Guo Lihong
Shen Xiaoming
Zhao Xuan
Nektar Therapeutics AL, Corporation
Truong Duc
Wilson Mark A.
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