US5120500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for nonpolluting mass deacidification of books and other paper products
Assignee: Battelle Ingenieurtechnik GmbH
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Filing: 1990-02-06
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Granted: 1992-06-09
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Expires: 2010-02-06
Abstract
Abstract Process and device for the nonpolluting mass deacidification of books and other printing and paper products with the predrying of these products by high-frequency radiation in a vacuum, then the application of a neutralization treatment with solutions for deacidification and the subsequent drying of solvents used also by high-frequency radiation in a vacuum. Preferably a single treatment chamber (1) for predrying, neutralizing and drying is used. The interior space of the treatment chamber can be exposed to high-frequency/microwave radiation of a generator (2), to which devices (4, 8, 9; 10 to 19 and 5) combined into a closed movable unit with chamber (1) are connected for the supply and removal of the solutions, for the evacuating of air and for the environmentally favorable separation of vapors when drying the accumulated exhaust air. The process and the device make possible a quick and efficient, as well as nonpolluting, mass deacidification with nearly complete recovery of the solvents.
Inventors
- 👤 Rolf Eggersdorfer
- 👤 Peter Schwerdt
- 👤 Jurgen Wittekind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:33
CPC Classifications
B; B41; B41M; B41M7/00; B41M7/0063; D; D21; D21H; D21H25/00; D21H25/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A process for deacidification of at least one book or other paper product comprising the steps of: a) predrying of the at least one book or other paper product to reduce the water content to a predetermined level by use of a vacuum; b) deacidifying the at least one book or other paper product using a solvent solution; and c) drying the at least one book or other paper product to reduce the solvent content to a predetermined level by use of vacuum, wherein microwave radiation is used along with the vacuum of either or both steps of a) and c) to aid in drying.
Claim 2
Dependent Claim
105 words
A process for deacidification of at least one book or other paper product comprising the steps of: a) predrying of the at least one book or other paper product to reduce the water content to a predetermined level by use of a vacuum; b) deacidifying the at least one book or other paper product using a solvent solution; and c) drying the at least one book or other paper product to reduce the solvent content to a predetermined level by use of vacuum, wherein microwave radiation is used along with the vacuum of either or both steps of a) and c) to aid in drying.
Claim 3
Dependent Claim
98 words
Process for nonpolluting mass deacidification of at least on book and other paper product using a neutralization treatment with a solution for deacidification and subsequent drying of the organic solvent or solvents suitable for the treatment of the books and other paper products, characterized in that a predrying of the at least one book or other paper product for substantially removing the moisture content and the drying of the organic solvent or solvents after the neutralization treatment of the at least on book or other paper product are each performed in a vacuum with heating using microwave radiation.
Claim 4
Dependent Claim
98 words
Process for nonpolluting mass deacidification of at least on book and other paper product using a neutralization treatment with a solution for deacidification and subsequent drying of the organic solvent or solvents suitable for the treatment of the books and other paper products, characterized in that a predrying of the at least one book or other paper product for substantially removing the moisture content and the drying of the organic solvent or solvents after the neutralization treatment of the at least on book or other paper product are each performed in a vacuum with heating using microwave radiation.
Claim 5
Dependent Claim
40 words
Process according to claim 2 wherein a solution of a magnesium organic compound in methanol, ethanol, fluorohydrocarbon, chlorofluorohydrocarbon, benzene or of mixtures of these materials is used, and wherein the predrying, deacidification and drying are performed in a treatment chamber.
Claim 6
Dependent Claim
31 words
Process according to claim 3 wherein the vapor of the solvent or solvents is removed from the exhaust air accumulating during the drying by condensation, adsorption, absorption or any combination thereof.
Claim 7
Dependent Claim
14 words
Process according to claim 4 wherein the predrying is performed in a separate chamber.
Claim 8
Dependent Claim
20 words
Process according to claim 5 wherein microwave radiation of a frequency of, e.g., 2450 MHz is applied for the heating.
Claim 9
Dependent Claim
33 words
Process according to claim 2 wherein the vapor of the solvent or solvents is removed from the exhaust air accumulating during the drying by means of condensation, adsorption, absorption or any combination thereof.
Claim 10
Dependent Claim
14 words
Process according to claim 2 wherein the predrying is performed in a separate chamber.
Claim 11
Dependent Claim
20 words
Process according to claim 2 wherein microwave radiation of a frequency of, e.g., 2450 MHz is applied for the heating.
Claim 12
Dependent Claim
24 words
Process according to claims 7 or 6 wherein the same generator for microwave radiation is used for said separate chamber and said treatment chamber.
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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) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |