US4029840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic leather
Assignee: Takiron Co Ltd
•
Filing: 1976-10-01
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Granted: 1977-06-14
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Expires: 1996-10-01
Abstract
Abstract Synthetic leather comprising cross-linked foamed syndiotactic 1,2-polybutadiene as a main ingredient.
Inventors
- 👤 Yasuo Shikinami
- 👤 Kosuke Iida
- 👤 Kunihiro Hata
- 👤 Tetsuya Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08J2309/00; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T442/00; Y10T442/40; Y10T442/469; Y10T442/60; Y10T442/647; Y10T442/652
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
14 words
Synthetic leather comprising a substrate carrying a resin layer comprising cross-linked, foamed syndiotactic 1,2-polybutadiene.
Claim 2
Dependent Claim
14 words
Synthetic leather comprising a substrate carrying a resin layer comprising cross-linked, foamed syndiotactic 1,2-polybutadiene.
Claim 3
Dependent Claim
19 words
Synthetic leather as claimed in claim 1 in which said resin layer consists only of cross-linked, foamed syndiotactic 1,2-polybutadiene.
Claim 4
Dependent Claim
17 words
Synthetic leather as claimed in claim 1, wherein said resin layer comprises 1,2-polybutadiene and another synthetic resin.
Claim 5
Dependent Claim
31 words
Synthetic leather as claimed in claim 3, wherein said another synthetic resin is low density polyethylene or an ethylene-vinyl acetate copolymer having not more than about 40 mol % vinyl acetate.
Claim 6
Dependent Claim
34 words
Synthetic leather as claimed in claim 4 wherein said another synthetic resin is used in an amount of about 10 to about 50% by weight based on the total weight of the synthetic leather.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |