Patent EP0273902A2 successfully refreshed from Google Patents.
EP0273902A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process and apparatus for the conservation treatment of paper
Assignee: Republik Osterreich Vertreten Durch Das Bundesministerium fur Wissenschaft und Forschung
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Filing: 1987-12-28
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Granted: —
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Expires: 2007-12-28
Abstract
Abstract To preserve paper, especially having a high content of mechanical pulp, the paper to be treated, which can already be in the form of a block of up to 400 pages is impregnated with a preservating solution in a vacuum chamber, followed by shock freezing and freeze drying. A mixture of strengthening and neutralising agents, preferably a mixed solution of methylcellulose and calcium hydroxide, serves as the preservating solution.
Inventors
- 👤 Otto Prof. Mag. Wächter
- 👤 Walter Ruhm
- 👤 Gerhard Dr. Banik
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:03
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/18
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Total Claims: 0
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