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
•
Filing: 1987-12-28
•
Granted: —
•
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 16:49
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.