US3837804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for deacidifying a book which has a pyroxylin-containing cover
Assignee: COUNCIL ON LIBRARY RES Inc
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Filing: 1973-08-15
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Granted: 1974-09-24
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Expires: 1993-08-15
Abstract
Abstract Books having pyroxylin-containing covers can be deacidified by impregnation with morpholine vapors without substantially damaging the covers, if the impregnation is conducted for about 5 to 15 minutes with a gaseous atmosphere consisting essentially of about 30 to 55 weight percent morpholine and a balance of water vapor at a temperature of about 90* to 115* F.
Inventors
- 👤 B Walker
- 👤 J Kusterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/16; A61L2/20; D; D21; D21H; D21H25/00; D21H25/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
The process of claim 1 wherein the book is impregnated for about 7 to 12 minutes.
Claim 2
Dependent Claim
25 words
The process of claim 1 wherein the gaseous atmosphere consists essentially of about 35 to 50 weight percent morpholine and a balance of water vapor.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the impregnation is conducted at a temperature of about 95* to 110* F.
Claim 4
Dependent Claim
56 words
The process of claim 1 wherein the paper pages prior to treatment have a pH of about 5.0 or lower, as determined by soaking 1 gram of one-eighth inch squares of the paper for 1 hour in 70 ml. of distilled, deionized water at room temperature and then measuring the pH of the resultant aqueous solution.
Claim 5
Dependent Claim
42 words
The process of claim 5 wherein the book is impregnated for about 7 to 12 minutes. 7. The process of claim 6 wherein the gaseous atmosphere consists essentially of about 35 to 50 weight percent morpholine and a balance of water vapor.
Claim 6
Dependent Claim
19 words
The process of claim 7 wherein the impregnation is conducted at a temperature of about 95* to 110* F.
Claim 7
Dependent Claim
134 words
A process for treating a book that has paper pages and a pyroxylin-containing cover so as to render the paper pages resistant to the deterioration that is promoted by acidic conditions in paper without effecting substantial damage to the pyroxylin-containing cover, which process comprises placing the book in an air tight treatment chamber, evacuating the treatment chamber to a pressure of about 0.7 mm. Hg or less, introducing a sufficient amount of a solution of morpholine-in-water containing about 30 to 55 weight percent morpholine into the chamber to provide a pressure within the chamber of about 10 to 100 mm. Hg, maintaining the temperature within the chamber at about 90* to 115* F., and purging the morpholine and water vapor atmosphere out of the chamber after about 5 to 15 minutes of residence time.
Claim 8
Dependent Claim
28 words
The process of claim 9 wherein the treatment chamber is evacuated to a pressure of about 0.5 mm. Hg or less prior to introducing the aqueous morpholine solution.
Claim 9
Dependent Claim
28 words
The process of claim 9 wherein the treatment chamber is evacuated to a pressure of about 0.20 mm. Hg or less prior to introducing the aqueous morpholine solution.
References Cited (Backward Citations)
US3135627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |