Patent US4760239A successfully refreshed from Google Patents.
US4760239A
Expired / Lapsed
US
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Method of and apparatus for applying a mark to paper and a paper for use in such method
Assignee: St Regis Paper Co UK Ltd
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Filing: 1986-05-23
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Granted: 1988-07-26
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Expires: 2006-05-23
Abstract
Abstract A method of applying a "pseudo watermark" to paper, comprises the steps of preparing a paper containing a suitable amount of a thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent. Apparatus suitable for applying heat to the paper is also disclosed.
Inventors
- 👤 Terence G. Makin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:32
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A method of applying a "pseudo watermark" to paper, which method comprises the steps of preparing a sheet or roll of paper containing a suitable amount of a thermally sensitive material, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent.
Claim 2
Independent Claim
57 words
A method of applying a "pseudo watermark" to paper, which method comprises the steps of preparing a sheet or roll of paper containing a suitable amount of a thermally sensitive material, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent.
Claim 3
Dependent Claim
18 words
The method of claim 1, in which the paper contains from 5 to 60% of thermally sensitive material.
Claim 4
Dependent Claim
15 words
The method of claim 1, in which the thermally sensitive material is a polyethylene polymer.
Claim 5
Dependent Claim
18 words
The method of claim 1, in which the heat is applied directly to the surface of the paper.
Claim 6
Dependent Claim
23 words
The method of claim 4, in which a heated die or plate is used to apply heat to the surface of the paper.
Claim 7
Dependent Claim
30 words
The method of claim 5, in which the die or plate is applied to the surface of the paper at pressure in the range of from 0 to 80 kPa.
Claim 8
Dependent Claim
23 words
The method of claim 1, in which heat is applied to produce a paper surface temperature in the range 100° to 300° C.
Claim 9
Dependent Claim
23 words
The method of claim 7, in which heat is applied to produce a paper surface temperature in the range 200° to 240° C.
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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |