Patent US3961317A successfully refreshed from Google Patents.
US4507418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compound for conveyor belts
Assignee: Bridgestone Corp
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Filing: 1983-09-29
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Granted: 1985-03-26
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Expires: 2003-09-29
Abstract
Abstract A rubber compound essentially for use in making conveyor belts on which tacky materials such as oil sands are transported without adhesion, comprising a base rubber such as acrylonitrile-butadiene rubbers, urethane rubbers, acryl rubbers and blends of these rubbers with polybutadiene rubbers, styrene-butadiene rubbers and natural rubbers, and an organic carboxylate such as alkyl oleates and alkyl stearates.
Inventors
- 👤 Tadashi Utsunomiya
- 👤 Yasuhiko Matsumuro
- 👤 Hideaki Saigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A rubber compound suitable for use in making conveyor belts, comprising: 100 parts by weight of a vulcanized base rubber; and 2 to 100 parts by weight of an organic carboxylate, said rubber compound being prepared by blending said organic carboxylate into a base rubber and vulcanizing the resulting blend or by impregnating the organic carboxylate in a surface of said vulcanized base rubber wherein when said rubber compound is formed into a sheet, said organic carboxylate bleeds at the surface of said sheet to prevent the adhesion of materials to said sheet.
Claim 2
Dependent Claim
93 words
A rubber compound suitable for use in making conveyor belts, comprising: 100 parts by weight of a vulcanized base rubber; and 2 to 100 parts by weight of an organic carboxylate, said rubber compound being prepared by blending said organic carboxylate into a base rubber and vulcanizing the resulting blend or by impregnating the organic carboxylate in a surface of said vulcanized base rubber wherein when said rubber compound is formed into a sheet, said organic carboxylate bleeds at the surface of said sheet to prevent the adhesion of materials to said sheet.
Claim 3
Dependent Claim
23 words
The rubber compound according to claim 1, wherein said organic carboxylate is an ester of an aliphatic carboxylic acid with an aliphatic alcohol.
Claim 4
Dependent Claim
23 words
The rubber compound according to claim 2, wherein said organic carboxylate is selected from the group consisting of alkyl oleates and alkyl stearates.
Claim 5
Dependent Claim
27 words
The rubber compound according to claim 3, wherein said organic carboxylate is selected from the group consisting of methyl oleate, butyl oleate, n-octyl oleate, and butyl stearate.
Claim 6
Dependent Claim
36 words
The rubber compound according to claim 1, wherein said base rubber is selected from the group consisting of acrylonitrile-butadiene rubbers, polyurethane rubbers, and polyacrylate rubbers, and blends thereof with polybutadiene rubbers, styrene-butadiene rubbers and natural rubbers.
Claim 7
Dependent Claim
15 words
The rubber compound according to claim 1, wherein said base rubber is a polyurethane rubber.
Claim 8
Dependent Claim
15 words
The rubber compound according to claim 1, wherein said base rubber is an acrylonitrile-butadiene rubber.
Claim 9
Dependent Claim
15 words
The rubber compound according to claim 1, wherein said base rubber is a polyacrylate rubber.
Claim 10
Dependent Claim
32 words
The rubber compound according to claim 1, wherein said organic carboxylate is present in an amount of 5 to 60 parts by weight per 100 parts by weight of the base rubber.
Claim 11
Dependent Claim
32 words
The rubber compound according to claim 1, wherein said organic carboxylate is present in an amount of 10 to 50 parts by weight per 100 parts by weight of the base rubber.
Claim 12
Dependent Claim
30 words
The rubber compound according to claim 1, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 13
Dependent Claim
30 words
The rubber compound according to claim 2, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 14
Dependent Claim
30 words
The rubber compound according to claim 3, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 15
Dependent Claim
30 words
The rubber compound according to claim 4, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 16
Dependent Claim
30 words
The rubber compound according to claim 5, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 17
Dependent Claim
30 words
The rubber compound according to claim 6, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 18
Dependent Claim
30 words
The rubber compound according to claim 7, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
Claim 19
Dependent Claim
30 words
The rubber compound according to claim 8, in the form of a sheet wherein said organic carboxylate bleeds at a surface thereof to prevent adhesion of materials to said surface.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |