US4807772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene closure with removable liner
Assignee: BPrex Healthcare Brookville Inc
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Filing: 1988-03-04
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Granted: 1989-02-28
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Expires: 2008-03-04
Abstract
Abstract A polypropylene compression molded closure with an elastomer liner that is removable, the elastomer being a blend of polyethylene and a rubbery copolymer, containing oil.
Inventors
- 👤 Francis M. Schloss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:24
CPC Classifications
B; B65; B65D; B65D41/00; B65D41/02; B65D41/04; B65D41/0435; B65D41/045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
A polypropylene closure with a top and a depending skirt, a liner for the inside of the top that is compression molded with the closure, the liner being removable without tearing, the liner being a blend of polyethylene and a thermoplastic, elastomeric copolymer.
Claim 2
Dependent Claim
43 words
A polypropylene closure with a top and a depending skirt, a liner for the inside of the top that is compression molded with the closure, the liner being removable without tearing, the liner being a blend of polyethylene and a thermoplastic, elastomeric copolymer.
Claim 3
Dependent Claim
28 words
A closure as defined in claim 1 in which the copolymer is a block copolymer of styrene and butadiene, the blend also containing mineral oil or petroleum oil.
Claim 4
Dependent Claim
20 words
A closure as defined in claim 1 in which the copolymer is a block copolymer of styrene and ethylene butylene.
Claim 5
Dependent Claim
18 words
A closure as defined in claim 1 in which the elastomer is a copolymer of ethylene and propylene.
Claim 6
Dependent Claim
27 words
A closure as defined in claim 1 in which the blend is about 40 to 80 wt. % copolymer and about 20 to 50 wt. % polyethylene.
Claim 7
Dependent Claim
21 words
A closure as defined in claim 1 in which the blend is about 60 wt. % copolymer and about 40% polyethylene.
Claim 8
Independent Claim
60 words
A method of making a polypropylene closure cap with a removable lining, the closure having a top closure wall with an inner and outer wall, the method comprising: compression molding a liner on the inner wall of the closure top, the liner being removable, elastomeric, and being a blend of polyethylene and a copolymer of styrene and a copolymerizable monomer.
Claim 9
Independent Claim
60 words
A method of making a polypropylene closure cap with a removable lining, the closure having a top closure wall with an inner and outer wall, the method comprising: compression molding a liner on the inner wall of the closure top, the liner being removable, elastomeric, and being a blend of polyethylene and a copolymer of styrene and a copolymerizable monomer.
Claim 10
Dependent Claim
18 words
A method as defined in claim 7 in which the blend also contains mineral oil or petroleum oil.
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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |