US4680340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easy to open package and a method of making same
Assignee: Cryovac LLC
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Filing: 1985-11-29
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Granted: 1987-07-14
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Expires: 2005-11-29
Abstract
Abstract A seal layer for an easy open package consisting essentially of 40% or less, by weight, of a first polymer having a melt flow index of less than 5 selected from the group consisting of ionomers and ethylene-vinyl acetate copolymers, and 60% or more by weight of a second polymer having a melt flow index greater than 20 being selected from the group consisting of low density polyethylene, ethylene-vinyl acetate copolymers, and modified ethylene-vinyl acetate copolymers, whereby the second polymer is a low density polyethylene if the first polymer is an ethylene-vinyl acetate copolymer.
Inventors
- 👤 Aurelio Oreglia
- 👤 Paolo Botto
- 👤 Claudio Freschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D75/00; B65D75/26; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A seal layer for an easy to open package consisting essentially of (a) 40% or less, by weight, of a first polymer having a melt flow index of less than 5 selected from the group consisting of ionomers and ethylene/vinly acetate cpolymers, and (b) 60% or more by weight of a second polymer having a melt flow index greater than 20 being selected from the group consisting of low density polyethylene, ethylene/vinyl acetate copolymers, and modified ethylene/vinyl acetate copolymers, whereby the second polymer is a low density polyethylene if the first polymer is an ethylene/vinyl acetate copolymer.
Claim 2
Dependent Claim
97 words
A seal layer for an easy to open package consisting essentially of (a) 40% or less, by weight, of a first polymer having a melt flow index of less than 5 selected from the group consisting of ionomers and ethylene/vinly acetate cpolymers, and (b) 60% or more by weight of a second polymer having a melt flow index greater than 20 being selected from the group consisting of low density polyethylene, ethylene/vinyl acetate copolymers, and modified ethylene/vinyl acetate copolymers, whereby the second polymer is a low density polyethylene if the first polymer is an ethylene/vinyl acetate copolymer.
Claim 3
Dependent Claim
43 words
A seal layer according to claim 1 in which the melt flow indices of the first polymer is less than 2 and the second polymer in the seal layer is greater than 20 when measured under the conditions E of ASTM D 1238.
Claim 4
Dependent Claim
46 words
A seal layer according to claim 1 in which the melt flow indices of the first polymer range from 0.7 to 5 and of the second polymer in the seal layer range from 27 to 35 when measured under the conditions E of ASTEM D 1238.
Claim 5
Dependent Claim
29 words
A seal layer according to anyone of claims 1 to 3 in which the seal layer has a total thickness in the range of about 5 to 15 microns.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |