Patent US4070434A successfully refreshed from Google Patents.
US4070434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing hollow plastic ball
Assignee: Nihon Nodalon Co Ltd
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Filing: 1976-12-17
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Granted: 1978-01-24
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Expires: 1996-12-17
Abstract
Abstract A method of manufacturing a hollow polyvinyl chloride resin ball. An inflating valve contained in the ball body is made of a plastisol composed mainly of polyethylene-vinyl acetate copolymer and acrylonitrile copolymer. The inflating valve prevents widening of the hole pierced therethrough and maintains an internal air pressure for a long period.
Inventors
- 👤 Jiseki Noda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:35
CPC Classifications
B; B29; B29D; B29D22/00; B29D22/02; B29C; B29C41/00; B29C41/003; B29C41/02; B29C41/20; B29C70/00; B29C70/68; B29C41/04; B29K; B29K2027/00; B29K2027/06; B29L; B29L2022/00; B29L2022/02; B29L2031/00; B29L2031/54; Y; Y10; Y10S; Y10S273/00; Y10S273/04; Y10S273/05; Y10T; Y10T137/00; Y10T137/3584
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
228 words
In a method of manufacturing a hollow polyvinyl chloride ball having an inflating valve therein and which has a valve body and a valve seat and wherein the valve body and valve seat firstly are sequentially molded of resins containing polyvinyl chloride and are integrally joined and placed in a hollow metal mold with the valve seat on the mold surface and the valve body projecting into the mold and then a polyvinyl chloride resin paste for the ball body is poured into the mold and thereafter the resulting ball body and the valve seat are integrally secured to each other, the improvement which comprises, in the step of molding the inflating valve, using a plastisol composed mainly of 20 to 80 parts by weight of polyethylene-vinyl acetate copolymer and 100 and 150 parts by weight of acrylonitrile copolymer for the formation of said inflating valve body and pouring said plastisol into a valve body mold for filling the mold only with the plastisol and then gelating it to form the inflating valve body, whereby a hole pierced in said valve body by an air injection needle inserted through the valve seat and the valve body is closed when the needle is withdrawn not only due to the action of internal pressure on the inflating valve, but also to the tackiness of the material of the valve body.
Claim 2
Dependent Claim
228 words
In a method of manufacturing a hollow polyvinyl chloride ball having an inflating valve therein and which has a valve body and a valve seat and wherein the valve body and valve seat firstly are sequentially molded of resins containing polyvinyl chloride and are integrally joined and placed in a hollow metal mold with the valve seat on the mold surface and the valve body projecting into the mold and then a polyvinyl chloride resin paste for the ball body is poured into the mold and thereafter the resulting ball body and the valve seat are integrally secured to each other, the improvement which comprises, in the step of molding the inflating valve, using a plastisol composed mainly of 20 to 80 parts by weight of polyethylene-vinyl acetate copolymer and 100 and 150 parts by weight of acrylonitrile copolymer for the formation of said inflating valve body and pouring said plastisol into a valve body mold for filling the mold only with the plastisol and then gelating it to form the inflating valve body, whereby a hole pierced in said valve body by an air injection needle inserted through the valve seat and the valve body is closed when the needle is withdrawn not only due to the action of internal pressure on the inflating valve, but also to the tackiness of the material of the valve body.
Claim 3
Dependent Claim
21 words
The improvement as claimed in claim 1 wherein the amount of polyethylene-vinyl acetate copolymer is 30 to 40 parts by weight.
Claim 4
Dependent Claim
54 words
The improvement as claimed in claim 1 wherein said plastisol is poured into the valve body mold, a resin consisting of substantially all polyvinyl chloride and plasticizer is poured into a valve seat mold positioned over the valve body mold, and the valve seat and valve body are gelated to form the inflating valve.
Claim 5
Dependent Claim
51 words
The improvement as claimed in claim 1 wherein a resin consisting of substantially all polyvinyl chloride and plasticizer is poured into a valve seat mold and gelated, and the valve body mold is placed over the valve seat mold and said plastisol is poured into the valve body mold and gelated.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |