Patent FR1199870A successfully refreshed from Google Patents.
US4680207A
Expired / Lapsed
US
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Thermoplastic sack
Assignee: NATIONAL TRUST Co A TRUST Co OF ONTARIO
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Filing: 1986-07-23
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Granted: 1987-07-14
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Expires: 2006-07-23
Abstract
Abstract A cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ratio of less than 6 but greater than the transverse direction draw ratio. The film has enhanced tensile and puncture resistance while maintaining acceptable tear properties and is used for shipping sacks.
Inventors
- 👤 Charles R. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:57
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C65/00; B29C65/02; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/23; B29C66/232; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/73713; B29C66/739; B29C66/7392; B29C66/73921; B32B27/06; B32B27/08; B65; B65D; B65D31/00; C; C08; C08J; C08J5/00; C08J5/18; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/54; B32B2307/558; B32B2307/58; B32B2307/581; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; B32B2439/02; B32B2439/06; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
50 words
A thermoplastic shipping sack having walls comprising a cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ratio of less than 6 but greater than the transverse direction draw ratio.
Claim 2
Dependent Claim
50 words
A thermoplastic shipping sack having walls comprising a cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ratio of less than 6 but greater than the transverse direction draw ratio.
Claim 3
Dependent Claim
26 words
A sack as claimed in claim 1 wherein said polyethylene film has a cold-drawn transverse direction ratio of 2 and a machine direction ratio of 5.
Claim 4
Dependent Claim
21 words
A sack as claimed in claim 1 wherein said linear low density polyethylene contains a minor amount of low density polyethylene.
Claim 5
Dependent Claim
21 words
A sack as claimed in claim 1 wherein said linear low density polyethylene contains a minor amount of high density polyethylene.
Claim 6
Dependent Claim
38 words
A sack as claimed in claim 1 wherein said film of unbalanced biaxially oriented linear low density polyethylene forms part of a multi-layer laminate with one or more layers of one or more compatible ethylene polymers or copolymers.
Claim 7
Dependent Claim
53 words
A sack as claimed in claim 1 wherein said sack comprises a front wall and a back wall, each of said front wall and said back wall comprising a ply of said unbalanced biaxially oriented linear low density polyethylene and wherein interposed between said plies are two inner plies of low density polyethylene.
Claim 8
Dependent Claim
14 words
A sack as claimed in claim 1 wherein the sack is a multi-ply sack.
Claim 9
Dependent Claim
43 words
A cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ratio of less than 6 but greater than the transverse direction draw ratio.
Claim 10
Dependent Claim
43 words
A cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ratio of less than 6 but greater than the transverse direction draw ratio.
Claim 11
Dependent Claim
22 words
A film as claimed in claim 8 having a cold-drawn transverse direction ratio of 2 and a machine direction ratio of 5.
Claim 12
Dependent Claim
33 words
A film as claimed in claim 8 wherein said linear low density polyethylene contains a minor amount of a low density polyethylene selected from a low density polyethylene and a high density polyethylene.
Claim 13
Dependent Claim
61 words
A themoplastic laminate comprising a cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ration of less than 6 but greater than the transverse direction draw ratio, and one or more layers of one or more compatible ethylene polymers or copolymers.
Claim 14
Dependent Claim
61 words
A themoplastic laminate comprising a cold-drawn unbalanced biaxially oriented linear low density polyethylene film having a transverse direction draw ratio selected from greater than 1 to less than 3 and a machine direction draw ration of less than 6 but greater than the transverse direction draw ratio, and one or more layers of one or more compatible ethylene polymers or copolymers.
Claim 15
Dependent Claim
25 words
A laminate as claimed in claim 11 wherein said film has a cold-drawn transverse direction ratio of 2 and a machine direction ratio of 5.
Claim 16
Dependent Claim
33 words
A laminate as claimed in claim 11 wherein said linear low density polyethylene contains a minor amount of a low density polyethylene selected from a low density polyethylene and a high density polyethylene.
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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 |