US4728549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayered container
Assignee: Mitsubishi Gas Chemical Co Inc
•
Filing: 1985-10-30
•
Granted: 1988-03-01
•
Expires: 2005-10-30
Abstract
Abstract A multilayered container comprising a wall portion consisting of thermoplastic gas barrier resin (resin B) layers and thermoplastic resin (resin A) layers, with the terminal portion of the mouth opening being of a thermoplastic resin (resin A), said wall portion being a multilayered structure formed by alternately laminating the resin A layers and the resin B layers in such a manner that there are at least two resin B layers, with the proviso that there is one more of the resin A layer than the number of the resin B layers, said structure having been biaxially oriented.
Inventors
- 👤 Senzo Shimizu
- 👤 Mitsuyasu Nagano
- 👤 Tsutomu Ishizeki
- 👤 Yoshiaki Momose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:04
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C45/00; B29C45/16; B29C45/1642; B29C45/1643; B32B27/34; B32B27/36; B29C2949/00; B29C2949/07; B29C2949/081; B29C2949/0811; B29C2949/082; B29C2949/0829; B29C2949/0861; B29C2949/0862; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/30; B29C2949/3016; B29C2949/3018; B29C2949/302; B29C2949/3022; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/303; B29C2949/3032; B29C2949/3034; B29C2949/3036; B29C2949/3038; B29K; B29K2067/00; B29K2077/00; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B29L; B29L2009/00; B32B2250/00; B32B2250/05; B32B2250/42; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2439/00; B32B2439/40; B32B2439/60; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31736; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A multilayered container wherein the terminal portion of the mouth opening is a single-layered structure of polyethylene terephthalate (resin A), and the wall portion is a five-layered structure composed of two layers of a m-xylylene group-containing polyamide resin (resin B) and three layers of resin A in which the middle layer and the innermost and outermost layers are formed of resin A and the two intermediate layers between the middle layer and the innermost and outermost layers are formed of resin B, said container being formed by biaxially stretching a parison obtained by sequentially injection-molding two resins A and B, the thickness of the wall portion ranging from 200 to 500 microns, and the ratios of the thicknesses of the innermost and outermost layers, middle layer and intermediate layers being in the ranges of 50-70:30-50:3-20.
Claim 2
Dependent Claim
135 words
A multilayered container wherein the terminal portion of the mouth opening is a single-layered structure of polyethylene terephthalate (resin A), and the wall portion is a five-layered structure composed of two layers of a m-xylylene group-containing polyamide resin (resin B) and three layers of resin A in which the middle layer and the innermost and outermost layers are formed of resin A and the two intermediate layers between the middle layer and the innermost and outermost layers are formed of resin B, said container being formed by biaxially stretching a parison obtained by sequentially injection-molding two resins A and B, the thickness of the wall portion ranging from 200 to 500 microns, and the ratios of the thicknesses of the innermost and outermost layers, middle layer and intermediate layers being in the ranges of 50-70:30-50:3-20.
References Cited (Backward Citations)
US3977153A
Cited
US4323531A
Cited
US4047873A
Cited
US4352766A
Cited
US4535901A
Cited
US4436778A
Cited
US4513037A
Cited
US4550043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |