US3941732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanizable rubber composition having improved physical properties
Assignee: Bridgestone Corp
•
Filing: 1974-12-12
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Granted: 1976-03-02
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Expires: 1994-12-12
Abstract
Abstract A stiffener, 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane, is used for improving physical properties of rubber compositions.
Inventors
- 👤 Toshio Yukuta
- 👤 Takashi Ohashi
- 👤 Hiroshi Yoshsii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/25; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
12 words
A vulcanizable rubber composition which comprises rubber and 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a stiffener.
Claim 2
Dependent Claim
12 words
A vulcanizable rubber composition which comprises rubber and 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a stiffener.
Claim 3
Dependent Claim
26 words
A vulcanizable rubber composition according to claim 1 which comprises 100 parts by weight of rubber and 0.1 - 5.0 parts by weight of 3,9-bis (2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane.
Claim 4
Dependent Claim
25 words
A vulcanizable rubber composition according to claim 1 which comprises 100 parts by weight of rubber and 0.5 - 2.0 parts by weight of 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane.
Claim 5
Dependent Claim
38 words
A vulcanizable rubber composition according to claim 1, in which said rubber is at least one selected from the group consisting of natural rubber, polyisoprene, styrene-butadiene copolymer, polybutadiene, ethylene-propylene copolymer, butyl rubber, nitrile rubber and the mixture thereof.
Claim 6
Dependent Claim
31 words
A vulcanizable rubber composition according to claim 1, in which said rubber is at least one selected from the group consisting of natural rubber, polyisoprene, styrene-butadiene copolymer and the mixture thereof.
Claim 7
Dependent Claim
42 words
A vulcanizable rubber composition which comprises 100 parts by weight of at least one rubber selected from the group consisting of natural rubber, polyisoprene, styrene-butadiene copolymer and the mixture thereof and 0.5 - 2.0 parts by weight of 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a stiffener.
Claim 8
Dependent Claim
42 words
A vulcanizable rubber composition which comprises 100 parts by weight of at least one rubber selected from the group consisting of natural rubber, polyisoprene, styrene-butadiene copolymer and the mixture thereof and 0.5 - 2.0 parts by weight of 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a stiffener.
Claim 9
Dependent Claim
19 words
A vulcanized rubber which is obtained by vulcanizing a rubber composition in the presence of 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a stiffener.
Claim 10
Dependent Claim
19 words
A vulcanized rubber which is obtained by vulcanizing a rubber composition in the presence of 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a stiffener.
Claim 11
Dependent Claim
8 words
A stiffener for a rubber composition comprising 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane.
Claim 12
Dependent Claim
8 words
A stiffener for a rubber composition comprising 3,9-(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane.
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US3317444A
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US3679707A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |