US4522843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deacidification of library materials
Assignee: SPATZ RICHARD E
•
Filing: 1984-01-25
•
Granted: 1985-06-11
•
Expires: 2004-01-25
Abstract
Abstract A method is provided of deacidifying books, imaged paper and other imaged material having a cellulose base comprising treating said material with suitable alkaline particles of basic metal oxide, hydroxide or salt dispersed in a gas or liquid in an amount and for a time sufficient to increase the pH of the material and provide an alkaline buffer without impairing the image thereon, said liquid consisting essentially of an inert halogenated hydrocarbon and a surfactant.
Inventors
- 👤 Robert A. Kundrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
B; B41; B41M; B41M7/00; B41M7/0063; D; D21; D21H; D21H25/00; D21H25/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
127 words
A method of deacidifiying books, imaged paper and other imaged material having a cellulose base comprising treating said material with suitable alkaline particles of a basic metal selected from the group consisting of oxides, hydroxides and salts having a predominant particle size between 0.01 and 0.9 micron and a surface area between 50 and 200 m 2 /g BET, dispersed in a gas with deposition enhancement by aerosol impingement, filtering through the paper or electrostatic attraction or dispersed in a liquid, in an amount and for a time sufficient to pass into the interstices of said imaged material and increase the PH of the material and provide an alkaline buffer without impairing the image thereon, said liquid consisting essentially of an inert halogenated hydrocarbon and a surfactant.
Claim 2
Independent Claim
127 words
A method of deacidifiying books, imaged paper and other imaged material having a cellulose base comprising treating said material with suitable alkaline particles of a basic metal selected from the group consisting of oxides, hydroxides and salts having a predominant particle size between 0.01 and 0.9 micron and a surface area between 50 and 200 m 2 /g BET, dispersed in a gas with deposition enhancement by aerosol impingement, filtering through the paper or electrostatic attraction or dispersed in a liquid, in an amount and for a time sufficient to pass into the interstices of said imaged material and increase the PH of the material and provide an alkaline buffer without impairing the image thereon, said liquid consisting essentially of an inert halogenated hydrocarbon and a surfactant.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the alkaline particles have an average particle size between 0.2 and 0.6 micron.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the basic metal is magnesium oxide.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein the basic metal is a salt selected from the group consisting of magnesium carbonate, zinc carbonate, sodium carbonate, potassium carbonate, calcium carbonate, sodium hydroxide, potassium hydroxide and calcium hydroxide.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the basic metal is a salt of calcium carbonate.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the basic metal is a salt of zinc carbonate.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein the particles are electrostatically transferred to the material.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein an aerosol is formed of the particles in a gas.
Claim 10
Dependent Claim
17 words
The method of claim 8 wherein the gas is selected from air, carbon dioxide, nitrogen and argon.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein an aerosol is formed of the particles in air.
Claim 12
Dependent Claim
14 words
The method of claim 1 wherein the alkaline particles are applied at high humidity.
Claim 13
Independent Claim
78 words
A method of deacidifying books, imaged paper and other imaged material having a cellulose base comprising treating said material with suitable alkaline particles of a basic metal selected from the group consisting of oxides, hydroxides and salts dispersed in a liquid in an amount and for a time sufficient to increase the pH of the material and provide an alkaline buffer without impairing the image thereon, said liquid consisting essentially of an inert halogenated hydrocarbon and a surfactant.
Claim 14
Independent Claim
78 words
A method of deacidifying books, imaged paper and other imaged material having a cellulose base comprising treating said material with suitable alkaline particles of a basic metal selected from the group consisting of oxides, hydroxides and salts dispersed in a liquid in an amount and for a time sufficient to increase the pH of the material and provide an alkaline buffer without impairing the image thereon, said liquid consisting essentially of an inert halogenated hydrocarbon and a surfactant.
Claim 15
Dependent Claim
11 words
The method of claim 12 wherein the halogenated hydrocarbon is 1,1,2-trichloro-1,2,2-trifluoroethane.
Claim 16
Dependent Claim
18 words
The method of claim 12 wherein the concentration of basic metal is between about 0.01% and about 0.3%.
Claim 17
Dependent Claim
18 words
The method of claim 12 wherein the concentration of basic metal is between about 0.01% and about 0.2%.
Claim 18
Dependent Claim
13 words
The method of claim 12 wherein the surfactant is a fluorinated alkyl ester.
Claim 19
Dependent Claim
16 words
The method of claim 12 wherein the predominant particle size is between 0.01 and 0.9 micron.
Claim 20
Dependent Claim
16 words
The method of claim 12 wherein the average particle size is between 0.2 and 0.6 micron.
Claim 21
Dependent Claim
22 words
The method of claim 12 wherein the average surface area of the particles ranges from 50 to 200 m 2 /g BET.
Claim 22
Dependent Claim
15 words
The method of claim 12 wherein the basic metal is an oxide of magnesium oxide.
Claim 23
Dependent Claim
31 words
The method of claim 12 wherein the basic metal is a salt selected from magnesium carbonate, zinc carbonate, sodium carbonate, potassium carbonate, calcium carbonate, sodium hydroxide, potassium hydroxide and calcium hydroxide.
Claim 24
Dependent Claim
15 words
The method of claim 12 wherein the basic metal is a salt of calcium carbonate.
Claim 25
Dependent Claim
18 words
The method of claim 12 wherein the concentration of the surfactant is between about 0.005% and about 1.0%.
Claim 26
Dependent Claim
17 words
The method of claim 12 wherein the concentration of the surfactant is between about 0.005% and 0.5%.
References Cited (Backward Citations)
US2033452A
Cited
US2864723A
Cited
US3472611A
Cited
US3676182A
Cited
US3676055A
Cited
US3898356A
Cited
US3969549A
Cited
US4051276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |