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US4814043A
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Apparatus for the manufacture of a material in the form of sheets or a web provided with a watermarklike pattern
Assignee: Tetra Laval Holdings and Finance SA
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Filing: 1987-09-30
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Granted: 1989-03-21
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Expires: 2007-09-30
Abstract
Abstract A material (1) in the form of sheets or a web is provided with a watermarklike pattern (12) in form of a text, figure or similar identification mark visible or displayable in transmitted light by means of relieflike mechanical working off of material, for example grinding, milling etc., corresponding to the desired pattern (12).
Inventors
- 👤 Hans Rausing
- 👤 Ingvar Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:36
CPC Classifications
B; B65; B65H; B65H35/00; B24; B24B; B24B19/00; B24B19/22; B24B19/223; B26; B26F; B26F3/00; B26F3/02; B44; B44B; B44B5/00; B44B5/0004; B44B5/0009; B44B5/009; B44C; B44C1/00; B44C1/22; B44C1/222; B44C1/225; B44C1/24; B65H35/10; B65H2701/00; B65H2701/10; B65H2701/19; B65H2701/1912
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
An apparatus for forming a watermarklike pattern on a web, said apparatus comprising: a grinding wheel; a matrix element having a relief conforming with the watermarklike pattern; and means for urging the grinding wheel and the relief of the matrix element in opposing relationship against opposite sides of the web, whereby material from regions of the web contacted by the relief is grinded away to produce the watermarklike pattern.
Claim 2
Independent Claim
69 words
An apparatus for forming a watermarklike pattern on a web, said apparatus comprising: a grinding wheel; a matrix element having a relief conforming with the watermarklike pattern; and means for urging the grinding wheel and the relief of the matrix element in opposing relationship against opposite sides of the web, whereby material from regions of the web contacted by the relief is grinded away to produce the watermarklike pattern.
Claim 3
Dependent Claim
13 words
The apparatus according to claim 1, wherein said urging means includes a roll.
Claim 4
Dependent Claim
37 words
The apparatus according to claim 1, wherein said urging means includes a roll mounted for rotation about an axis parallel to the axis of rotation of said grinding wheel, said matrix element being mounted on said roll.
Claim 5
Dependent Claim
23 words
The apparatus according to claim 3, wherein said apparatus includes guide means for passing a web between said grinding wheel and said roll.
Claim 6
Dependent Claim
55 words
The apparatus according to claim 3, wherein the smallest distance between the surface of said grinding wheel and said roll is at least equal to the thickness of said web, and the smallest distance between the highest point of said matrix surface is greater than zero, so that grinding holes through the web are avoided.
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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |