US3865799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered plate of polyvinyl chloride resin and method of making the same
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1972-08-21
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Granted: 1975-02-11
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Expires: 1992-08-21
Abstract
Abstract A plate, prepared by sintering a mixture of 100 parts by weight of polyvinyl chloride resin and from 0.1 to 10 parts by weight of a surface active agent, which has a tensile strength of at least 0.7 kg/mm2, has very high wettability and permeability for water, and resistance to combustion. Among other uses, the plate may serve in packings for cooling towers due to these excellent properties mentioned. The invention also relates to a method of making the plate.
Inventors
- 👤 Kotaro Katagiri
- 👤 Yoshio Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/24; B; B29; B29C; B29C67/00; B29C67/02; B29C67/04; B29C67/20; B29C67/205; F; F28; F28F; F28F25/00; F28F25/02; F28F25/08; F28F25/087; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S261/00; Y10S261/11; Y10S521/00; Y10S521/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A SINTERED POROUS PLATE FOR USE AS PACKING IN A COOLING TOWER, SAID PLATE BEING FORMED OF POLYVINYL CHLORIDE HOMOPOLYMER RESIN HAVING A TENSILE STRENGTH OF AT LEAST 0.7KG/MM2, AND CONTAINING A MIXTURE OF 100 PARTS BY WEIGHT OF POLYVINYL CHLORIDE RESIN, AT LEAST 90% BY WEIGHT OF WHICH HAS A PARTICLE SIZE OF FROM 10 TO 150U, AND FROM 0.1 TO 10 PARTS BY WEIGHT OF ONE OR MORE SURFACE ACTIVE AGENTS.
Claim 2
Dependent Claim
73 words
A SINTERED POROUS PLATE FOR USE AS PACKING IN A COOLING TOWER, SAID PLATE BEING FORMED OF POLYVINYL CHLORIDE HOMOPOLYMER RESIN HAVING A TENSILE STRENGTH OF AT LEAST 0.7KG/MM2, AND CONTAINING A MIXTURE OF 100 PARTS BY WEIGHT OF POLYVINYL CHLORIDE RESIN, AT LEAST 90% BY WEIGHT OF WHICH HAS A PARTICLE SIZE OF FROM 10 TO 150U, AND FROM 0.1 TO 10 PARTS BY WEIGHT OF ONE OR MORE SURFACE ACTIVE AGENTS.
Claim 3
Dependent Claim
70 words
A method for preparing a sintered plate as claimed in claim 1 which comprises the steps of mixing 100 parts by weight of polyvinyl chloride homopolymer resin and from 0.1 to 10 parts by weight of a surface active agent, spreading the mixture uniformly over a metal plate and thereafter heating it at a temperature of from 180* to 300* C for a period of from 1 to 30 minutes.
Claim 4
Dependent Claim
31 words
The method claimed in claim 2 wherein at least 90% by weight of the polyvinyl chloride resin has a particle size in the range of from 10 to 150 Mu .
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |