US5409736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deacidification of cellulose based materials using perfluorinated carriers
Assignee: Preservation Technologies LP
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Filing: 1993-08-31
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Granted: 1995-04-25
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Expires: 2013-08-31
Abstract
Abstract An improved method of deacidifying books, imaged paper and other imaged materials having a cellulose base wherein, for a sufficient time to raise the pH of the materials, the materials are treated with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in an inert perflourinated carrier, preferably selected from the group consisting of perfluoropolyoxyether, perfluoromorpholine and combinations thereof. Perfluoropolyoxyether alkanoic acid is added as a surfactant. Alternatively, when perfluoromorpholine is the carrier of choice, the surfactant may instead be potassium fluoroalkyl carboxylate.
Inventors
- 👤 Lee H. Leiner
- 👤 Edward W. Kifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:12
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
In a method of deacidifying cellulose based materials which includes the step of contacting said material with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a liquid carrier in an amount and for a time sufficient to pass said particles into the interstices of the cellulose based materials and increase the pH thereof, the improvement comprising: dispersing said particles in an inert medium comprised of said liquid carrier and a surfactant, wherein the liquid carrier is a perfluorinated compound.
Claim 2
Dependent Claim
83 words
In a method of deacidifying cellulose based materials which includes the step of contacting said material with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a liquid carrier in an amount and for a time sufficient to pass said particles into the interstices of the cellulose based materials and increase the pH thereof, the improvement comprising: dispersing said particles in an inert medium comprised of said liquid carrier and a surfactant, wherein the liquid carrier is a perfluorinated compound.
Claim 3
Dependent Claim
80 words
In a method of deacidifying cellulose based materials which includes the step of contacting the materials with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a liquid carrier in an amount and for a time sufficient to pass said particles into the interstices of the materials and increase the pH thereof, the improvement comprising: dispersing said particles in an inert medium comprised of the liquid carrier and a surfactant wherein the surfactant is perfluoropolyoxyether alkanoic acid.
Claim 4
Dependent Claim
80 words
In a method of deacidifying cellulose based materials which includes the step of contacting the materials with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a liquid carrier in an amount and for a time sufficient to pass said particles into the interstices of the materials and increase the pH thereof, the improvement comprising: dispersing said particles in an inert medium comprised of the liquid carrier and a surfactant wherein the surfactant is perfluoropolyoxyether alkanoic acid.
Claim 5
Dependent Claim
116 words
In a method of deacidifying cellulose based materials which includes the step of contacting the materials with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a liquid carrier in an amount and for a time sufficient to pass said particles into the interstices of the materials and increase the pH thereof, the improvement comprising: dispersing said particles in an inert medium comprised of the liquid carrier and a surfactant wherein the liquid carrier and surfactant are selected from the group consisting of perfluoropolyoxyether as the liquid carrier and perfluoropolyoxyether alkanoic acid as the surfactant, and perfluoromorpholine as the liquid carrier and either perfluoropolyoxyether alkanoic acid or potassium fluoroalkyl carboxylate as the surfactant.
Claim 6
Dependent Claim
116 words
In a method of deacidifying cellulose based materials which includes the step of contacting the materials with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a liquid carrier in an amount and for a time sufficient to pass said particles into the interstices of the materials and increase the pH thereof, the improvement comprising: dispersing said particles in an inert medium comprised of the liquid carrier and a surfactant wherein the liquid carrier and surfactant are selected from the group consisting of perfluoropolyoxyether as the liquid carrier and perfluoropolyoxyether alkanoic acid as the surfactant, and perfluoromorpholine as the liquid carrier and either perfluoropolyoxyether alkanoic acid or potassium fluoroalkyl carboxylate as the surfactant.
Claim 7
Dependent Claim
19 words
The method of claim 3 wherein the surfactant is present in amounts of between 0.03 and 0.05 weight percent.
Claim 8
Dependent Claim
20 words
The method of claim 2 wherein the alkaline particles are present in amounts between about 0.01 and 0.3 weight percent.
Claim 9
Dependent Claim
19 words
The method of claim 2 wherein the surfactant is present in amounts of between 0.03 and 0.05 weight percent.
Claim 10
Dependent Claim
20 words
The method of claim 3 wherein the alkaline particles are present in amounts between about 0.01 and 0.3 weight percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |