Patent US4394340A successfully refreshed from Google Patents.
US4394340A
Expired / Lapsed
US
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Method of producing thin-walled endless belt
Assignee: Hokushin Industries Corp
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Filing: 1981-10-28
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Granted: 1983-07-19
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Expires: 2001-10-28
Abstract
Abstract An improved method of producing a thin-walled endless belt by centrifugal molding, which comprises introducing a liquid curable silicone rubber dissolved in a solvent into a rotating cylindrical mold, hardening said liquid curable silicone rubber to form a mold surface on the inner surface of said cylindrical mold, and thereafter introducing a thermosetting resin dissolved in a volatile solvent onto said mold surface to form the endless belt.
Inventors
- 👤 Noriyoshi Tarumi
- 👤 Hiroshi Tsuchiya
- 👤 Masakazu Kokiso
- 👤 Hiroaki Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:07
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/22; B29C41/04; B29C41/042; B29K; B29K2079/00; B29K2083/00; B29L; B29L2031/00; B29L2031/709; B29L2031/7094
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
146 words
A method of producing a thin-walled endless belt having a thickness between 30 and 500 microns by centrifugal molding which comprises introducing a liquid curable silicone rubber dissolved in a solvent into a rotating cylindrical mold to coat the inner surface of said mold, hardening said liquid curable silicone rubber to form a silicone rubber coated mold surface on the inner surface of said cylindrical mold, and thereafter introducing into said rotating cylindrical mold a thermosetting resin which is at least one heat resistant resin selected from the group consisting of polyimide, polyamide-imide and polybenzimidazole resins dissolved in a volatile solvent onto said inner silicone rubber coated mold surface to coat said inner silicone rubber coated mold surface, then hardening said thermosetting resin and then removing said hardened thermosetting resin from said mold to form said endless belt having a thickness between 30 and 500 microns.
Claim 2
Independent Claim
146 words
A method of producing a thin-walled endless belt having a thickness between 30 and 500 microns by centrifugal molding which comprises introducing a liquid curable silicone rubber dissolved in a solvent into a rotating cylindrical mold to coat the inner surface of said mold, hardening said liquid curable silicone rubber to form a silicone rubber coated mold surface on the inner surface of said cylindrical mold, and thereafter introducing into said rotating cylindrical mold a thermosetting resin which is at least one heat resistant resin selected from the group consisting of polyimide, polyamide-imide and polybenzimidazole resins dissolved in a volatile solvent onto said inner silicone rubber coated mold surface to coat said inner silicone rubber coated mold surface, then hardening said thermosetting resin and then removing said hardened thermosetting resin from said mold to form said endless belt having a thickness between 30 and 500 microns.
Claim 3
Dependent Claim
33 words
The method according to claim 1, wherein said liquid curable silicone rubber is at least one rubber selected from the group consisting of a heat curable silicone rubber and a cold-curable silicone rubber.
Claim 4
Dependent Claim
30 words
The method according to claim 2, wherein said liquid curable silicone rubber is at least one rubber selected from the group consisting of a dimethylpolysiloxane, a methylphenylpolysiloxane and a methylvinylpolysiloxane.
Claim 5
Dependent Claim
13 words
The method according to claim 1, wherein said solvent is an organic solvent.
Claim 6
Dependent Claim
28 words
The method according to claim 4, wherein said organic solvent is at least one solvent selected from the group consisting of a silicone oil, benzene, toluene and xylene.
Claim 7
Dependent Claim
26 words
The method according to claim 1, wherein said volatile solvent is at least one solvent from the group consisting of an N-methyl-2-pyrolidone and an N,N-dimethyl acetamide.
Claim 8
Dependent Claim
30 words
The method according to claim 1, wherein said liquid curable silicone rubber solution has a concentration of from 20 to 40% and a viscosity of from 0.1 to 5 P.
Claim 9
Dependent Claim
28 words
The method according to claim 1, wherein said thermosetting resin solution has a concentration of from 30 to 70% and a viscosity of from 0.5 to 5 P.
Claim 10
Dependent Claim
52 words
The method according to claim 1, wherein said liquid curable silicone rubber solution has a concentration of from 20 to 40% and a viscosity of from 0.1 to 5 P, and said thermosetting resin solution has a concentration of from 30 to 70% and a viscosity of from 0.5 to 5 P.
Claim 11
Dependent Claim
57 words
The method according to claim 9, wherein said solvent in which said liquid curable silicone rubber is dissolved is at least one solvent selected from the group consisting of a silicone oil, benzene, toluene and xylene, and wherein said volatile solvent is at least one solvent from the group consisting of an N-methyl-2-pyrolidone and an N,N-dimethyl acetamide.
Claim 12
Dependent Claim
30 words
The method according to claim 10, wherein said liquid curable silicone rubber is at least one rubber selected from the group consisting of a dimethylpolysiloxane, a methylphenylpolysiloxane and a methylvinylpolysiloxane.
Claim 13
Dependent Claim
57 words
The method according to claim 1, wherein said solvent in which said liquid curable silicone rubber is dissolved is at least one solvent selected from the group consisting of a silicone oil, benzene, toluene and xylene, and wherein said volatile solvent is at least one solvent from the group consisting of an N-methyl-2-pyrolidone and an N,N-dimethyl acetamide.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |