Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Reexamination Certificate
2003-01-29
2010-02-16
Jiang, Shaojia Anna (Department: 1623)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
C536S053000, C536S124000
Reexamination Certificate
active
07662953
ABSTRACT:
The invention relates to a method for manufacturing cellulose carbamate. In the method, an auxiliary agent and urea in solution form and possibly in solid form are absorbed into cellulose, and a reaction between cellulose and urea is carried out in a mixture containing cellulose, a liquid, the auxiliary agent, and urea The absorption of the auxiliary agent and urea into cellulose, and the reaction between the cellulose and the auxiliary agent at least partly are carried out in a working device. According to the invention, it is possible to manufacture cellulose carbamate without ammonia, organic solvents or other auxiliary agents, by using only a small quantity of water as a medium.
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Communication issued by European Patent Office in counterpart European patent application 03700823.2, Feb. 2009.
Notification of Reason for Refusal issued by Japanese patent office in counterpart application 2003-564096 Jul. 21, 2009.
Sivonen Eino
Valta Kyösti
Franklin Eric J.
Jiang Shaojia Anna
Valtion Teknillinen Tutkimuskeskus
Venable LLP
White Everett
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