Patent US4497856A successfully refreshed from Google Patents.
US4497856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layered hollow container
Assignee: Toppan Inc
•
Filing: 1982-12-22
•
Granted: 1985-02-05
•
Expires: 2002-12-22
Abstract
Abstract Multi-layered containers are disclosed including an inner layer of a thermoplastic fluorocarbon resin, an outer layer of polyolefin, and an intermediate layer therebetween of a mixture of either polyolefin grafted with an unsaturated glycidyl compound or an ethylene copolymer grafted with an unsaturated glycidyl compound. The containers possess unexpectedly improved properties, including moldability and interlaminar strength, and are excellent candidates for containing agricultural chemicals, fuel oil and industrial chemicals of various types.
Inventors
- 👤 Nobuyuki Iwasawa
- 👤 Keiji Kazato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:22
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/08; B32B25/12; B32B25/18; B32B27/00; B32B27/18; B32B27/20; B32B27/32; B32B27/322; B32B2327/00; B32B2327/12; B32B2327/18; B32B2439/00; Y; Y10; Y10S; Y10S220/00; Y10S220/917; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1372; Y10T428/1386; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31826; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A multi-layered container comprising an inner layer, an outer layer, and an intermediate layer therebetween, said inner layer comprising a thermoplastic ethylene-tetrafluoroethylene alternating copolymer resin, said outer layer comprising a polyolefin, and said intermediate layer comprising from about 30 to about 80% by weight of ethylene-vinyl acetate copolymer graft-modified with an unsaturated glycidyl compound, from about 5 to about 35% by weight of a gum rubber compound, and from about 10 to about 50% by weight of a polyolefin.
Claim 2
Dependent Claim
79 words
A multi-layered container comprising an inner layer, an outer layer, and an intermediate layer therebetween, said inner layer comprising a thermoplastic ethylene-tetrafluoroethylene alternating copolymer resin, said outer layer comprising a polyolefin, and said intermediate layer comprising from about 30 to about 80% by weight of ethylene-vinyl acetate copolymer graft-modified with an unsaturated glycidyl compound, from about 5 to about 35% by weight of a gum rubber compound, and from about 10 to about 50% by weight of a polyolefin.
Claim 3
Dependent Claim
47 words
The multi-layered container of claim 1, wherein said gum rubber compound is selected from the group consisting of natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butyl rubber, chloroprene type synthetic rubber, acryl rubber, urethane rubber, polybutadiene rubber, ethylene-propylene rubber, ethylene-propylene terpolymer, polyether rubber, polybutene-1 rubber, and ethylene-butadiene rubber.
Claim 4
Dependent Claim
23 words
The multi-layered container of claim 2, wherein said gum rubber compound is selected from the group consisting of ethylene-propylene rubber and ethylene-propylene terpolymers.
Claim 5
Dependent Claim
53 words
The multi-layered container of claim 1, wherein said intermediate layer comprises from about 50 to 65% by weight of said ethylene-vinyl acetate copolymer grafted with an unsaturated glycidyl compound, from about 20 to 30% by weight of said polyolefin, and from about 15 to about 25% by weight of said gum rubber compound.
Claim 6
Dependent Claim
24 words
The multi-layered container of claim 1, wherein said outer layer includes a compound selected from the group consisting of inorganic fillers and fiber compounds.
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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |