Method of preserving and storing books and other papers
AssigneeThe United States of America as represented by the Librarian of Congress
InventorDonald K. Sebera
Life of this patent
Estimating the term…
Abstract
Books and other documents that are produced wholly or partly on paper of wood pulp origin are preserved by storing in an enclosed space containing a controlled atmosphere including about 0.05 to 10 ppm ammonia gas. This invention and all United States patent rights thereunder are assigned to the Government of the United States as represented by the Librarian of Congress. The invention described herein may be manufactured and used by or for the Government of the United States of America for Governmental purposes without the payment of any royalties thereon.
Claims20
Method of operating a long-term book storage and preservation system for books having pages of acidic paper in a room having no noticeable ammonia smell and an environment which is non-toxic to humans comprising placing said books for long-term storage in a closed storage room having a controlled continuously maintained mildly alkaline atmosphere which includes gaseous ammonia in a range from about 0.05 to about 1 volume parts per million, whereby the acidity of said book pages is gradually neutralized or an already neutralized book is maintained in a neutralized condition by storage in said long-term storage room.
Method of operating a long-term storage and preservation system for acidic paper of cellulosic material in a room having no noticeable ammonia smell and an environment which is non-toxic to humans, comprising placing said paper for long-term storage in a closed storage room having a controlled continuously maintained mildly alkaline atmosphere which includes gaseous ammonia in a range from about 0.05 to about 1 volume part per million, whereby the acidity of said paper is gradually neutralized or an already neutralized paper is maintained in a neutralized condition by storage in said long-term storage room.
Method of operating a long-term book storage and preservation system for books having pages of acidic paper in a room having no noticeable ammonia smell and an environment which is non-toxic to humans, comprising placing said books for long-term storage in a closed storage room having a controlled continuously maintained mildly alkaline atmosphere which includes gaseous ammonia in a range from about 0.05 to about 1 volume parts per million, whereby the acidity of said book pages is gradually neutralized by storage in said long-term storage room.
Dependencies are inferred from the claim text.