Patent US4424242A successfully refreshed from Google Patents.
US4424242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Containers having improved gas barrier properties
Assignee: Eastman Chemical Co
•
Filing: 1983-04-25
•
Granted: 1984-01-03
•
Expires: 2003-04-25
Abstract
Abstract The present invention provides novel multilayer packaging materials having improved resistance to gas permeability. The present invention also provides containers which are formed from the novel packaging material. The multilayer packaing material comprises at least one film comprising polyglycolic acid and at least one film formed from a polyester comprising units derived from terephthalic acid and ethylene glycol. The containers which are provided by the present invention may be in the form of sheet, film, molded articles, such as bottles, and other such structures.
Inventors
- 👤 Robert B. Barbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:59
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
36 words
A multilayer packaging material having low gas permeability comprising (a) at least one film comprising polyglycolic acid, and (b) at least one film formed from a polyester comprising units derived from terephthalic acid and ethylene glycol.
Claim 2
Dependent Claim
36 words
A multilayer packaging material having low gas permeability comprising (a) at least one film comprising polyglycolic acid, and (b) at least one film formed from a polyester comprising units derived from terephthalic acid and ethylene glycol.
Claim 3
Dependent Claim
12 words
The packaging material of claim 1 wherein said polyester comprises polyethylene terephthalate.
Claim 4
Dependent Claim
19 words
The packaging material of claim 1 wherein said polyester comprises units derived from terephthalic acid, ethylene glycol, and 1,4-cyclohexylenedimethanol.
Claim 5
Dependent Claim
18 words
The packaging material of claim 3 wherein the molar ratio of ethylene glycol to 1,4-cyclohexylenedimethanol is about 70:30.
Claim 6
Dependent Claim
22 words
The packaging material of claim 1 wherein said film comprising polyglycolic acid further comprises up to about 30 mol percent lactic acid.
Claim 7
Dependent Claim
22 words
The packaging material of claim 5 wherein said film comprising polyglycolic acid further comprises about 10 to 20 mole percent lactic acid.
Claim 8
Dependent Claim
10 words
A container formed from the packaging material of claim 1.
Claim 9
Dependent Claim
11 words
A laminated film formed from the packaging material of claim 5.
Claim 10
Dependent Claim
11 words
A molded container formed from the packaging material of claim 6.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |