Patent US3972974A successfully refreshed from Google Patents.
US3972974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of abrasion-resistant screening apparatus
Assignee: Individual
•
Filing: 1970-09-04
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Granted: 1976-08-03
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Expires: 1990-09-04
Abstract
Abstract A perforate screening member having a substrate with an upper surface and perforation sidewalls covered with elastomer to protect against abrasion is formed by casting elastomer into place adhered to the substrate at locations to be protected.
Inventors
- 👤 Francisco A. Pico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:13
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4618; B05; B05D; B05D1/00; B05D1/30; B07B1/469; B05D1/32; B07B2201/00; B07B2201/02; Y; Y10; Y10S; Y10S264/00; Y10S264/70; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A method of coating a perforated substrate to produce a screening member of increased abrasion resistance, said substrate having upper and lower major surfaces interconnected by side surfaces and having perforations defined by sidewalls extending between said major surfaces, said method comprising the steps of inserting a form axially into each perforation to define a molding cavity between the form and perforation sidewall which is accessible from said upper surface; providing means preventing overflow of said side surfaces; pouring hardenable elastomer onto said upper surface and into each molding cavity to form a coating adhered to said upper surface and to perforation sidewall contiguous to the cavity; hardening said elastomer; and removing said forms.
Claim 2
Independent Claim
114 words
A method of coating a perforated substrate to produce a screening member of increased abrasion resistance, said substrate having upper and lower major surfaces interconnected by side surfaces and having perforations defined by sidewalls extending between said major surfaces, said method comprising the steps of inserting a form axially into each perforation to define a molding cavity between the form and perforation sidewall which is accessible from said upper surface; providing means preventing overflow of said side surfaces; pouring hardenable elastomer onto said upper surface and into each molding cavity to form a coating adhered to said upper surface and to perforation sidewall contiguous to the cavity; hardening said elastomer; and removing said forms.
Claim 3
Dependent Claim
25 words
A method of coating as recited in claim 1 wherein the perforations of the substrate are circular in cross-section and the forms are multi-diameter plugs.
Claim 4
Dependent Claim
33 words
A method of coating as recited in claim 2 wherein the upper surface of the substrate is maintained level during the pouring step to provide a uniform depth coating on said upper surface.
Claim 5
Dependent Claim
41 words
A method of coating as recited in claim 2 wherein each plug has a large diameter section, an intermediate diameter section and a small diameter section, the sections being coaxial with one another and superposed in that order one upon another.
Claim 6
Dependent Claim
34 words
A method of coating as recited in claim 4 wherein said intermediate diameter section has a diameter equal to that of a substrate perforation and is adapted to hold said plug in said perforation.
Claim 7
Dependent Claim
79 words
A method of coating as recited in claim 5 wherein each said small diameter section extends in an axial direction through a perforation to provide an annular molding cavity and extends to a point past the upper surface of the coating applied to the upper substrate surface and wherein the step of pouring hardenable elastomer onto said upper substrate surface is in such manner as to leave said small diameter sections protruding above said upper surface of the coating.
Claim 8
Dependent Claim
16 words
A method of coating as recited in claim 1 where each form is fabricated of polyethylene.
Claim 9
Dependent Claim
37 words
A method of coating as recited in claim 1 wherein each form is coated with a release agent prior to its insertion to prevent adhesion of the elastomeric substance to the form as a consequence of coating.
Claim 10
Dependent Claim
15 words
A method of coating as recited in claim 1 wherein the elastomeric substance is polyurethane.
Claim 11
Independent Claim
114 words
A method of coating a perforated substrate to produce a screening member of increased abrasion resistance, said substrate having upper and lower major surfaces interconnected by side surfaces and having perforations defined by sidewalls extending between said major surfaces, said method comprising the steps of inserting a form into each perforation so that it extends axially to a point sufficiently spaced past said upper surface so that it will extend beyond the coating to be applied; providing means preventing overflow of said side surfaces; pouring hardenable elastomer onto said upper surface to form a coating adhered to said surface while leaving said forms protruding above the coating; hardening said elastomer; and removing said forms.
Claim 12
Independent Claim
114 words
A method of coating a perforated substrate to produce a screening member of increased abrasion resistance, said substrate having upper and lower major surfaces interconnected by side surfaces and having perforations defined by sidewalls extending between said major surfaces, said method comprising the steps of inserting a form into each perforation so that it extends axially to a point sufficiently spaced past said upper surface so that it will extend beyond the coating to be applied; providing means preventing overflow of said side surfaces; pouring hardenable elastomer onto said upper surface to form a coating adhered to said surface while leaving said forms protruding above the coating; hardening said elastomer; and removing said forms.
Claim 13
Dependent Claim
14 words
A method of coating as recited in claim 10 wherein the elastomer is polyurethane.
Claim 14
Dependent Claim
37 words
A method of coating as recited in claim 11 wherein each form is coated with a release agent prior to its insertion to prevent adhesion of the elastomeric substance to the form as a consequence of coating.
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |