Patent US3661694A successfully refreshed from Google Patents.
US3661694A
Expired / Lapsed
US
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Bidirectionally oriented corrugated plates
Assignee: Solvay SA
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Filing: 1970-12-30
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Granted: 1972-05-09
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Expires: 1990-12-30
Abstract
Abstract Corrugated plates are made of polyvinyl chloride resin, and are bidirectionally oriented in such a manner that an element which is sampled therefrom presents a retraction of at least 30 percent along the two main axes of the plates after a residence of 8 hours in an oven kept at 140* C. The plates have a resiliency in tension at 20* C in excess of 650 cm kgf/cm2 and a resiliency in prestressed condition in excess of 300 kfg/cm2. They are resistant at 4* C to impacts caused by boxwood balls of 200 mm diameter which are projected perpendicularly against the surface of said plates at a speed such that their kinetic energy is 0.105 m kgf.
Inventors
- 👤 Jean Francois Bequet
- 👤 Roger Van Asbroeck
- 👤 Paul Du Bois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:43
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/22; E; E04; E04C; E04C2/00; E04C2/30; E04C2/32; E04C2/322; E04D; E04D3/00; E04D3/24; E04D3/32; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
A corrugated plate according to claim 1 having a shrinkage of at least 30 percent along each of its two main axes after a residence of 8 hours at 140* C.
Claim 2
Dependent Claim
15 words
A corrugated plate according to claim 1 wherein the vinyl chloride resin is polyvinyl chloride.
Claim 3
Dependent Claim
18 words
A corrugated plate according to claim 1 wherein the vinyl chloride resin is a copolymer of vinyl chloride.
Claim 4
Dependent Claim
20 words
A corrugated plate according to claim 1 wherein the vinyl chloride resin is an admixture of two vinyl chloride resins.
Claim 5
Dependent Claim
34 words
A corrugated plate according to claim 1 wherein the vinyl chloride resin is compounded with at least one compounding agent selected from the group consisting of stabilizer, lubricant, processing aid, filler, pigment and plasticizer.
Claim 6
Dependent Claim
8 words
A trapezoidally corrugated plate according to claim 1.
Claim 7
Dependent Claim
71 words
A process for increasing resistance in both tension and prestress condition and impact resistance at 4* C of a vinyl chloride resin corrugated plate which comprises bidirectionally stretching to an extent of at least 30 percent at a temperature of at least 85* C vinyl chloride resin sheet from which the corrugated plate is formed and cooling the corrugated plate to a temperature below the glass transition temperature of the resin.
References Cited (Backward Citations)
US2582294A
Cited
US3244799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |