Patent US3579926A successfully refreshed from Google Patents.
US3579926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandblasting stencil and method of making same
Assignee: Pall Canada Ltd
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Filing: 1968-08-02
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Granted: 1971-05-25
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Expires: 1988-08-02
Abstract
Abstract This invention provides a method for precutting sandblasting stencil by cutting with a die a two-ply stencil comprising a soft, elastomeric masking sheet of material resistant to erosion by sandblasting, having on one face a layer of adhesive which is removably bonded to a harder, flexible nonelastomeric plastic backing sheet, so as to cut out the stencil pattern through the masking sheet without cutting through the backing sheet. The second face of the masking sheet is then covered with an adherent sandblast-erodable retaining sheet to form a three-ply die-cut stencil sheet. For use in sandblasting, the backing sheet is stripped off, exposing the adhesive layer on the masking sheet, which is thereby bonded to a stone surface after the cutout portions are removed. This invention also provides the three-ply die-cut stencil sheet comprising sandblasting-erosion-resistant masking sheet, an adhesive layer bonded to a backing sheet on one surface of the masking sheet and an adherent retaining sheet bonded to the second face of the masking sheet.
Inventors
- 👤 Anthony Mario Gaspari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:04
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/14; B41C1/141; B24; B24C; B24C1/00; B24C1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A three-ply stencil product for use in inscribing a hard surface by sandblasting comprising an intermediate erosionresistant stencil ply having a hardness of not greater than about 80 Shore A and having a stencil pattern cut therethrough; an adhesive layer on a first face of the stencil ply to secure the stencil ply to the surface to be inscribed; a flexible plastic backing ply having a hardness of at least about 75 Shore D, resistant to being cut by a stencil cutting die, secured to the first face of the stencil ply by means of the adhesive layer; and an uncut, flexible sandblast-erodable plastic retaining ply having a hardness of at least about 75 Shore D bonded to the second face of the stencil ply by an adhesive coating.
Claim 2
Dependent Claim
129 words
A three-ply stencil product for use in inscribing a hard surface by sandblasting comprising an intermediate erosionresistant stencil ply having a hardness of not greater than about 80 Shore A and having a stencil pattern cut therethrough; an adhesive layer on a first face of the stencil ply to secure the stencil ply to the surface to be inscribed; a flexible plastic backing ply having a hardness of at least about 75 Shore D, resistant to being cut by a stencil cutting die, secured to the first face of the stencil ply by means of the adhesive layer; and an uncut, flexible sandblast-erodable plastic retaining ply having a hardness of at least about 75 Shore D bonded to the second face of the stencil ply by an adhesive coating.
Claim 3
Dependent Claim
27 words
The stencil product of claim 1 wherein the stencil pattern cut through the stencil ply is retained in place between the backing ply and the retaining ply.
Claim 4
Dependent Claim
25 words
The stencil product of claim 1 wherein the stencil ply is formed of a semicured rubber and the backing ply is formed of polyester film.
Claim 5
Dependent Claim
13 words
The stencil product of claim 1 wherein the adhesive layer is rubber cement.
Claim 6
Dependent Claim
28 words
The stencil product of claim 1 wherein the retaining ply has a pressure-sensitive adhesive coating which bonds the retaining ply to the second face of the stencil ply.
Claim 7
Dependent Claim
19 words
The stencil product of claim 1 wherein the stencil ply is formed of soft, uncured or partially cured rubber.
Claim 8
Dependent Claim
32 words
The stencil product of claim 1 wherein the retaining ply and the backing ply are formed from materials selected from the group consisting of polyester film, nylon film and regenerated cellulose film.
Claim 9
Dependent Claim
25 words
A three-ply stencil product according to claim 1, in which the stencil ply has a hardness in the range from about 40 to about 70.
Claim 10
Dependent Claim
122 words
A thRee-ply stencil product for use in inscribing a hard surface by sandblasting comprising an intermediate erosion-resistant stencil ply having a stencil pattern cut therethrough; an adhesive layer on a first face of the stencil ply to secure the stencil ply to the surface to be inscribed; a hard, flexible plastic backing ply, resistant to being cut by a stencil cutting die, secured to the first face of the stencil ply by means of the adhesive layer; and an uncut, flexible sandblast-erodable plastic retaining ply bonded to the second face of the stencil ply by an adhesive coating; said backing ply and retaining ply being formed from materials selected from the group consisting of polyester film, nylon film and regenerated cellulose film.
Claim 11
Dependent Claim
122 words
A thRee-ply stencil product for use in inscribing a hard surface by sandblasting comprising an intermediate erosion-resistant stencil ply having a stencil pattern cut therethrough; an adhesive layer on a first face of the stencil ply to secure the stencil ply to the surface to be inscribed; a hard, flexible plastic backing ply, resistant to being cut by a stencil cutting die, secured to the first face of the stencil ply by means of the adhesive layer; and an uncut, flexible sandblast-erodable plastic retaining ply bonded to the second face of the stencil ply by an adhesive coating; said backing ply and retaining ply being formed from materials selected from the group consisting of polyester film, nylon film and regenerated cellulose film.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |