US4863566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preservation of printed cellulosic materials
Assignee: Individual
•
Filing: 1988-04-26
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Granted: 1989-09-05
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Expires: 2008-04-26
Abstract
Abstract A process and composition for use in the deacidification of cellulosic materials, such as books and printed papers, which comprises treating the materials under vacuum condition with a gaseous mixture of ammonia, and an organo epoxide reagent selected from the group consisting of alkyl compounds or mixtures thereof, and which produce in situ primary, secondary and tertiary amino compounds upon reaction with the ammonia.
Inventors
- 👤 Morris J. Warren
- 👤 Michael L. Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:36
CPC Classifications
B; B41; B41M; B41M7/00; B41M7/0063; D; D21; D21H; D21H25/00; D21H25/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
In a process for the treatment of cellulosic material to preserve the cellulosic material against deterioration through aging, the steps of placing the cellulosic material to be treated in air-tight chamber and evacuating the chamber, injecting ammonia into the evacuated chamber to penetrate the cellulosic material, introducing water vapor into the evacuated chamber, and introducing an alkene oxide reagent into the evacuated chamber which reacts to produce primary, secondary, and tertiary amines in situ.
Claim 2
Dependent Claim
74 words
In a process for the treatment of cellulosic material to preserve the cellulosic material against deterioration through aging, the steps of placing the cellulosic material to be treated in air-tight chamber and evacuating the chamber, injecting ammonia into the evacuated chamber to penetrate the cellulosic material, introducing water vapor into the evacuated chamber, and introducing an alkene oxide reagent into the evacuated chamber which reacts to produce primary, secondary, and tertiary amines in situ.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1, wherein the reagent is gaseous ethylene oxide.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 1, wherein the reagent is gaseous propylene oxide.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1, wherein the reagent is a mixture of gaseous ethylene oxide and propylene oxide.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1 wherein the reagent oomprises a gaseous mixture of ethylene oxide and carbon dioxide.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1 wherein the reagent comprises a gaseous mixture of ethylene oxide, carbon dioxide and butylene oxide.
Claim 8
Dependent Claim
21 words
A process as claimed in claim 1 wherein the ammonia is in the form of a solution comprising NH 4 OH.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 1 wherein the amines in situ comprise alkanolamines.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |