Patent US4444828A successfully refreshed from Google Patents.
US4444828A
Expired / Lapsed
US
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Multilayer trash bag film
Assignee: Glad Products Co
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Filing: 1982-01-28
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Granted: 1984-04-24
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Expires: 2002-01-28
Abstract
Abstract A multilayer plastic film suitable for use in the manufacture of garbage and trash bags wherein the film comprises one or more layers representing at least one first outer layer and may include a core layer made with low pressure, low density polyethylene and one or more layers representing at least one second outer layer made with high pressure, low density polyethylene which may contain up to forty-two percent by weight of low pressure, low density polyethylene.
Inventors
- 👤 John Anthony
- 👤 Jerome T. Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:33
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/322; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
109 words
A multilayer film having a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 2
Dependent Claim
109 words
A multilayer film having a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 3
Dependent Claim
31 words
A multilayer film as in claim 1 wherein said low pressure, low density polyethylene comprises a copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and octene-1.
Claim 4
Dependent Claim
28 words
A multilayer film as in claim 1 wherein said low pressure, low density polyethylene has a melt index of between about 0.6 and about 1.2 decigrams per minute.
Claim 5
Dependent Claim
41 words
A multilayer film as in claim 1 wherein said high pressure, low density polyethylene has a melt index of between about 1 to 3 decigrams per minute and a density of between about 0.916 and about 0.924 grams per cubic centimeter.
Claim 6
Dependent Claim
21 words
A multilayer film as in claim 1 wherein said low pressure, low density polyethylene comprises a copolymer of ethylene and butene-1.
Claim 7
Dependent Claim
31 words
A multilayer film as in claim 1 wherein the thickness ratio of said first outer layer and said core layer to said second outer layer is between about 1:1 and 2:1.
Claim 8
Dependent Claim
28 words
A multilayer film as in claim 1 wherein the thickness ratio of said first outer layer and said core layer to said second outer layer is about 2:1.
Claim 9
Dependent Claim
131 words
A multilayer film having a first outer layer consisting essentially of low pressure, low density polyethylene copolymer, and a second outer layer consisting essentially of high pressure, low density polyethylene or a blend of said high pressure, low density polyethylene and up to about fourty-two percent by weight of said low pressure, low density polyethylene based on the weight of the blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 10
Dependent Claim
131 words
A multilayer film having a first outer layer consisting essentially of low pressure, low density polyethylene copolymer, and a second outer layer consisting essentially of high pressure, low density polyethylene or a blend of said high pressure, low density polyethylene and up to about fourty-two percent by weight of said low pressure, low density polyethylene based on the weight of the blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 11
Dependent Claim
26 words
A multilayer film as in claim 8 wherein said first outer layer comprises up to about 67 percent of the total thickness of said multilayer film.
Claim 12
Dependent Claim
21 words
A multilayer film as in claim 8 wherein said first outer layer and said second outer layer may contain a colorant.
Claim 13
Dependent Claim
24 words
A multilayer film as in claim 8 wherein the total thickness of said multilayer film in between about 1 mil and about 3 mils.
Claim 14
Dependent Claim
133 words
A multilayer film having a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of a blend of high pressure, low density polyethylene and up to about forty-two percent by weight of low pressure, low density polyethylene based on the weight of said blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 15
Dependent Claim
133 words
A multilayer film having a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of a blend of high pressure, low density polyethylene and up to about forty-two percent by weight of low pressure, low density polyethylene based on the weight of said blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 16
Independent Claim
114 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 17
Independent Claim
114 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 18
Independent Claim
104 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene copolymer, and a second outer layer consisting essentially of high pressure, low density polyethylene, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 19
Independent Claim
104 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene copolymer, and a second outer layer consisting essentially of high pressure, low density polyethylene, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 20
Independent Claim
138 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of a blend of high pressure, low density polyethylene and up to about forty-two percent by weight of low pressure, low density polyethylene based on the weight of said blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 21
Independent Claim
138 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of a blend of high pressure, low density polyethylene and up to about forty-two percent by weight of low pressure, low density polyethylene based on the weight of said blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 22
Independent Claim
157 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer having one or more layers wherein at least one of said layers consists essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene or a blend of said high pressure, low density polyethylene containing up to about forty-two percent by weight of low pressure, low density polyethylene based on the weight of said blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 23
Independent Claim
157 words
A method of preparing a multilayer film comprising co-extruding a first outer layer consisting essentially of low pressure, low density polyethylene, a core layer having one or more layers wherein at least one of said layers consists essentially of low pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene or a blend of said high pressure, low density polyethylene containing up to about forty-two percent by weight of low pressure, low density polyethylene based on the weight of said blend, said low pressure, low density polyethylene having a melt index of between about 0.5 and about 3.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter, and said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |