Patent US5871615A successfully refreshed from Google Patents.
US5871615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of security paper
Assignee: Arjo Wiggins Fine Papers Ltd
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Filing: 1995-06-07
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Granted: 1999-02-16
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Expires: 2015-06-07
Abstract
Abstract Security paper carries an intricate tactile surface profile pattern which has been imparted to the paper during its manufacture, at a stage after initial de-watering but before final drying, by passing the paper through a nip between a forming surface corresponding to the desired pattern and a backing surface. The tactile pattern is of excellent durability, and its intricacy offers a high degree of security. The tactile pattern is visible when viewed under low angle light, which facilitates verification or authentication of security documents made using the patterned paper.
Inventors
- 👤 Colin Austin Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:52
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/02; D21F; D21F1/00; D21F1/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
A method of producing security paper carrying an intricate tactile surface profile pattern, comprising the step of passing an initially de-watered, but not yet fully-dried paper web through a nip between a forming surface corresponding to the desired pattern and a backing surface, thereby to impart the intricate tactile surface profile pattern to the surface of the web, prior to drying the web in conventional manner.
Claim 2
Independent Claim
66 words
A method of producing security paper carrying an intricate tactile surface profile pattern, comprising the step of passing an initially de-watered, but not yet fully-dried paper web through a nip between a forming surface corresponding to the desired pattern and a backing surface, thereby to impart the intricate tactile surface profile pattern to the surface of the web, prior to drying the web in conventional manner.
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1, wherein the forming and backing surfaces are the surfaces of respective rolls which together form the nip.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 2 wherein the forming surface is an engraved rubber surface with a maximum peak to valley dimension of the order of 1 to 1.5 mm.
Claim 5
Dependent Claim
38 words
A process as claimed in claim 3, wherein the backing roll surface is also of rubber, and the hardness of the rubber in both the forming and backing surfaces is of the order of 65° to 95° Shore.
Claim 6
Dependent Claim
44 words
A process as claimed in claim 4, wherein the nip pressure is of the order of 25 to 30 kg/linear cm and the web moisture content of the web as the web enters the nip is in the range 50 to 65% by weight.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 2 wherein the forming surface is a laser-engraved rubber surface.
Claim 8
Independent Claim
66 words
A method for producing a security paper carrying an intricate tactile surface profile pattern which has been imparted to the paper during its manufacture, at a stare after initial de-watering but before final drying, said method including steps of initial de-watering and final drying and further comprising passing the paper through a nip between a forming surface corresponding to the desired pattern and a backing surface.
Claim 9
Independent Claim
66 words
A method for producing a security paper carrying an intricate tactile surface profile pattern which has been imparted to the paper during its manufacture, at a stare after initial de-watering but before final drying, said method including steps of initial de-watering and final drying and further comprising passing the paper through a nip between a forming surface corresponding to the desired pattern and a backing surface.
References Cited (Backward Citations)
US1281951A
Cited
GB119398A
Cited
US1687140A
Cited
GB215302A
Cited
GB413834A
Cited
GB458758A
Cited
GB596693A
Cited
GB627759A
Cited
GB836615A
Cited
GB917049A
Cited
GB1063672A
Cited
US4033059A
Cited
GB1447933A
Cited
CA1019012A
Cited
US4216055A
Cited
GB2149827A
Cited
US4715623A
Cited
US4720325A
Cited
EP0194042A2
Cited
WO1990002658A1
Cited
WO1992011413A1
Cited
EP0581414A1
Cited
GB2270931A
Cited
WO1994008089A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-15 | 2002-08-17 | 2003-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-15 | 2006-08-17 | 2007-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-15 | 2010-08-17 | 2011-02-16 | $7700.00 | Window Closed / Lapsed |