US4735855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoformable laminate
Assignee: Cryovac LLC
•
Filing: 1986-08-04
•
Granted: 1988-04-05
•
Expires: 2006-08-04
Abstract
Abstract A thermoformable polymeric laminate with good optical properties, extended shelf life, and memory characteristics comprises a core layer comprising an oxygen barrier material; a polyamide layer disposed on each surface respectively of the core layer, the polyamide having controlled crystallinity; a sealant layer; an outer layer comprising a moisture barrier material; and an intermediate layer disposed between the polyamide layer and each of the sealant layer and outer layer respectively, and comprising an anhydride grafted polyolefin.
Inventors
- 👤 George D. Wofford
- 👤 Jack L. Shriver, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:31
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2323/00; B32B2323/04; B32B2323/046; B32B2323/10; B32B2331/00; B32B2331/04; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A thermoformable polymeric laminate comprising: (a) a core layer comprising an oxygen barrier material; (b) a polyamide layer disposed on each surface respectively of the core layer, the polyamide including a nucleating agent; (c) an outer sealant layer; (d) a second outer layer comprising a moisture barrier material; and (e) an intermediate layer disposed between the polyamide layer and each of the sealant layer and second outer layer respectively, and comprising an anhydide grafted polyolefin.
Claim 2
Dependent Claim
75 words
A thermoformable polymeric laminate comprising: (a) a core layer comprising an oxygen barrier material; (b) a polyamide layer disposed on each surface respectively of the core layer, the polyamide including a nucleating agent; (c) an outer sealant layer; (d) a second outer layer comprising a moisture barrier material; and (e) an intermediate layer disposed between the polyamide layer and each of the sealant layer and second outer layer respectively, and comprising an anhydide grafted polyolefin.
Claim 3
Dependent Claim
16 words
The laminate according to claim 1 wherein the oxygen barrier material comprises ethylene vinyl alcohol copolymer.
Claim 4
Dependent Claim
13 words
The laminate according to claim 1 wherein the polyamide comprises nucleated nylon 6.
Claim 5
Dependent Claim
28 words
The laminate according to claim 1 wherein the sealant layer is a heat-sealable material taken from the group consisting of ionomer, polyolefins, ethylene-alpha olefin copolymers, and blends thereof.
Claim 6
Dependent Claim
16 words
The sealant layer according to claim 5 further comprising a small amount of an antiblock agent.
Claim 7
Dependent Claim
12 words
The laminate according to claim 1 wherein the outer layer comprises polypropylene.
Claim 8
Dependent Claim
36 words
The laminate according to claim 1 wherein the anhydride-grafted polyolefin comprises a polyolefin selected from the group consisting of ethylene vinyl acetate copolymer, polypropylene, low density polyethylene, linear low density polyethylene and very low density polyethylene.
Claim 9
Dependent Claim
12 words
The laminate according to claim 1 where the nucleating agent is talc.
References Cited (Backward Citations)
US3912843A
Cited
US4407873A
Cited
US4501798A
Cited
US4612221A
Cited
US4683170A
Cited
US4640852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |