US3811570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane screen with backing member
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1971-05-20
•
Granted: 1974-05-21
•
Expires: 1991-05-20
Abstract
Abstract An improved shaker screen having openings therein for the size particles desired, comprising a plastic or hard elastomeric member and a facing member of a polyurethane elastomer having a Shore A hardness of 30 to 90.
Inventors
- 👤 J Sawyer
- 👤 T Holding
- 👤 R Schisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:28
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/469; B32B27/40; B32B3/00; B32B3/26; B32B3/266; B32B3/30; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/50; B32B2307/536
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
The screen of claim 1 wherein the polyurethane is the reaction product of essentially a polyester polyol having 2 to 3 hydroxyls, an organic polyisocyanate selected from the class of toluene diisocyanate, methylene di(phenylisocyanate), hydrogenated methylene di(phenylisocyanate) and isophorone diisocyanate and a crosslinker selected from the class of diamines and polyols less than 800 in molecular weight.
Claim 2
Dependent Claim
57 words
The screen of claim 1 wherein the polyurethane is the reaction product of essentially a polyether polyol having 2 to 3 hydroxyls, an organic polyisocyanate selected from the class of toluene diisocyanate, methylene di(phenylisocyanate), hydrogenated methylene di(phenylisocyanate) and isophorone diisocyanate and a crosslinker selected from the class of diamines and polyols less than 800 in molecular weight.
Claim 3
Dependent Claim
22 words
The screen of claim 3 wherein the polyether polyol is selected from the class of polypropylene ether polyols and polytetramethylene ether polyols.
Claim 4
Dependent Claim
21 words
The screen of claim 1 wherein between the opening in said member a rib projects downward to reinforce the backing member.
Claim 5
Dependent Claim
15 words
The screen of claim 1 having a wire reinforcing member positioned in the backing member.
References Cited (Backward Citations)
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |