US4619735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of retarding paper degradation with time by treatment with melamine, and method of producing ageing-resistant paper coated with melamine
Assignee: Melamine Chemicals Inc
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Filing: 1985-02-13
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Granted: 1986-10-28
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Expires: 2005-02-13
Abstract
Abstract Degradation of paper is retarded by treating paper with melamine. Method of treating existing paper with melamine to stop or retard degradation and methods for inclusion of melamine in paper as made to provide an age resistance paper are described. Rare books, paintings and prints can be preserved or books, paintings and prints as originally formed can use melamine-treated paper to retard degradation.
Inventors
- 👤 Richard V. Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:43
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; B; B41; B41M; B41M7/00; B41M7/0063; D21H25/00; D21H25/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
The method of treating existing paper products to retard degradation upon ageing over a prolonged time period comprising contacting existing paper with a super-critical solution of a melamine compound selected from the group consisting of melamine, ammeline, melam, melem, and mixtures thereof, to provide on said paper at least a superfical coating of said melamine compound, said coating being effective to retard the degradation of paper upon ageing over a prolonged time period.
Claim 2
Independent Claim
73 words
The method of treating existing paper products to retard degradation upon ageing over a prolonged time period comprising contacting existing paper with a super-critical solution of a melamine compound selected from the group consisting of melamine, ammeline, melam, melem, and mixtures thereof, to provide on said paper at least a superfical coating of said melamine compound, said coating being effective to retard the degradation of paper upon ageing over a prolonged time period.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the existing paper being treated is a book.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said melamine compound is melamine.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein said melamine is present in a super-critical solution of carbon dioxide.
Claim 6
Dependent Claim
17 words
The method of claim 3 wherein said melamine is present in a super-critical solution of fluorinated hydrocarbon.
Claim 7
Independent Claim
87 words
The method of preserving a paper product from degradation comprising (1) providing a paper or paperboard mat having incorporated therein a free melamine compound selected from the group consisting of melamine, ammeline, melam, melem, and mixtures thereof in an amount sufficient to permit transfer; and (2) placing said product to be preserved adjacent to and in contact with said mat of step (1) whereby said melamine compound from said mat can diffuse into and contact said paper product in an amount sufficient to preserve said paper product.
Claim 8
Independent Claim
87 words
The method of preserving a paper product from degradation comprising (1) providing a paper or paperboard mat having incorporated therein a free melamine compound selected from the group consisting of melamine, ammeline, melam, melem, and mixtures thereof in an amount sufficient to permit transfer; and (2) placing said product to be preserved adjacent to and in contact with said mat of step (1) whereby said melamine compound from said mat can diffuse into and contact said paper product in an amount sufficient to preserve said paper product.
Claim 9
Dependent Claim
11 words
The method of claim 6 wherein said melamine compound is melamine.
Claim 10
Dependent Claim
12 words
The method of claim 6 wherein said paper product is a painting.
Claim 11
Dependent Claim
15 words
The method of claim 6 wherein said paper product is a print of a painting.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |