Patent US3818832A successfully refreshed from Google Patents.
US3818832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming an engraved plate
Assignee: Stone Container Corp
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Filing: 1972-08-02
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Granted: 1974-06-25
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Expires: 1992-08-02
Abstract
Abstract An engraving blanket which comprises an engraveable layer of live resilient rubber material vulcanized at one face to a face of a base layer of nonhard, nonresilient rubber material. Talcum powder is evenly dispersed between the vulcanized faces of the two layers to control the degree of adhesion between the two. This permits selected portions of the engraveable layer to be cut out and stripped from the base layer to produce a printing design and yet provides sufficient adhesion to keep the layers together during use of the blanket. The disclosure also relates to the method of making the engraving blanket.
Inventors
- 👤 T Coale
- 👤 D Tompkins
- 👤 S Gunn
- 👤 F Merrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:22
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/02; B41N; B41N1/00; B41N1/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
The method of making an engraving blanket including the steps of providing a first layer of relatively live relisient material of a rubber composition and having a printing face and a stripping face and providing a second layer of relatively nonhard, nonresilient material compatible for vulcanization with the material of the first layer and being of a rubber composition and having a stripping face, uniformly adding a small but effective amount of talcum powder on the order of one-fourth gram for each square yard to at least one of said stripping faces, placing the stripping face of said first layer into contiguous contact with the stripping face of said second layer, placing the first and second layers in a vulcanizing press and vulcanizing the two layers together, cutting through the printing face of said first layer down to said stripping faces in a given pattern and stripping the pattern of said first layer from said second layer to leave indicia for printing at said printing face of said first layer.
Claim 2
Independent Claim
170 words
The method of making an engraving blanket including the steps of providing a first layer of relatively live relisient material of a rubber composition and having a printing face and a stripping face and providing a second layer of relatively nonhard, nonresilient material compatible for vulcanization with the material of the first layer and being of a rubber composition and having a stripping face, uniformly adding a small but effective amount of talcum powder on the order of one-fourth gram for each square yard to at least one of said stripping faces, placing the stripping face of said first layer into contiguous contact with the stripping face of said second layer, placing the first and second layers in a vulcanizing press and vulcanizing the two layers together, cutting through the printing face of said first layer down to said stripping faces in a given pattern and stripping the pattern of said first layer from said second layer to leave indicia for printing at said printing face of said first layer.
Claim 3
Dependent Claim
44 words
The method as claimed in claim 1, wherein said rubber composition of said engraveable layer is a vulcanizable natural rubber or a vulcanizable polyblend of polyvinyl chloride and a nitrile rubber and said rubber composition of said base layer is a vulcanizable nitrile rubber.
Claim 4
Dependent Claim
30 words
The method as claimed in claim 2, wherein the Shore Durometer (Shore A) Hardness of the engraveable layer and the base layer are on the order of 50 - 55.
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |