US4382052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for vulcanization of elastomer products
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1981-10-16
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Granted: 1983-05-03
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Expires: 2001-10-16
Abstract
Abstract An improved process for vulcanization of elastomer products which includes the steps of heating under pressure, the elastomer product mounted in a metal mold by supplying vulcanizing medium, suspending the supply of the vulcanizing medium when the elastomer product has reached a predetermined temperature or passed through a predetermined time period, and subsequently supplying insert gas preliminarily extracted from atmospheric air and maintained at least under approximately the same pressure as that of the vulcanizing medium, up to the termination of the heating step so as to maintain the elastomer product at the predetermined temperature.
Inventors
- 👤 Toshio Arimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:01
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29C; B29C35/00; B29C35/02; B29C35/0288; B29C35/0294; B29C35/04; B29C35/045; B29C2035/047; B29C2035/048; B29C35/16; B29C2035/1616; B29C35/049; B29D30/0662; B29D2030/0675; B29K; B29K2021/00; B29L; B29L2030/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A process for vulcanization of elastomer products which comprises the steps of heating under pressure, the elastomer product mounted in a metal mold by supplying thereto vulcanizing medium, suspending the supply of said vulcanizing medium when said elastomer product has reached a predetermined temperature or passed through a predetermined time period, and subsequently supplying inert gas preliminarily extracted from atmospheric air with use of molecular sieves, and maintained at least under approximately the same pressure as that of said vulcanizing medium as a heat retaining medium, up to the termination of remaining time period for the heating step so as to maintain the elastomer product at said predetermined temperature.
Claim 2
Dependent Claim
109 words
A process for vulcanization of elastomer products which comprises the steps of heating under pressure, the elastomer product mounted in a metal mold by supplying thereto vulcanizing medium, suspending the supply of said vulcanizing medium when said elastomer product has reached a predetermined temperature or passed through a predetermined time period, and subsequently supplying inert gas preliminarily extracted from atmospheric air with use of molecular sieves, and maintained at least under approximately the same pressure as that of said vulcanizing medium as a heat retaining medium, up to the termination of remaining time period for the heating step so as to maintain the elastomer product at said predetermined temperature.
Claim 3
Dependent Claim
30 words
A process for vulcanization as claimed in claim 1, wherein said vulcanizing medium and inert gas are arranged to be supplied into the elastomer product through an expandable bag-like member.
Claim 4
Dependent Claim
19 words
A process for vulcanization as claimed in claim 1, or 2, wherein said molecular sieves are made of carbon.
Claim 5
Dependent Claim
25 words
A process for vulcanization as claimed in claim 1 or 2, wherein said inert gas has oxygen concentration therein, of less than approximately 1000 ppm.
Claim 6
Dependent Claim
25 words
A process for vulcanization as claimed in claim 1 or 2, wherein said inert gas has oxygen concentration therein, of less than approximately 50 ppm.
Claim 7
Dependent Claim
25 words
A process for vulcanization as claimed in claim 1 or 2, wherein said inert gas has oxygen concentration therein, of approximately 4 to 5 ppm.
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) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |