US5092469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easily-openable packaging container
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1990-01-17
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Granted: 1992-03-03
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Expires: 2010-01-17
Abstract
Abstract The present invention relates to the use of a multilayer sheet for producing a multilayer container suitable for heat sterilization packaging, which makes the setting of the heat sealing condition at heat sealing of a lid member easy, and is able to make a package which not only has an excellent sealing property, but also a good easy openability and which can be opened with a stable opening force, provides a peeled surface having a good appearance and has an excelent resistance to boiling and retort treatment.
Inventors
- 👤 Yukio Takata
- 👤 Takeshi Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:02
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/06; B65; B65D; B65D5/00; B65D5/42; B65D5/54; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/74; B29C65/745; B29C65/76; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/13; B29C66/131; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5346; B29C66/53461; B29C66/54; B29C66/542; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/73; B29C66/739; B29C66/7392; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/81431; B29C66/816; B29C66/8161; B29C66/83; B29C66/832; B29C66/8322; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B65D77/00; B65D77/10; B65D77/20; B65D77/2024; B65D77/2028; B65D77/2032; B65D77/2044; B65D77/2048; B65D77/2052; B29C2793/00; B29C2793/0054; B29C66/7232; B29C66/72321; B29C66/7234; B29C66/72341; B29C66/737; B29C66/7377; B29C66/73771; B29C66/73773; B29C66/73775; B29C66/73921; B29C66/818; B29C66/8181; B32B2439/00; B65D2577/00; B65D2577/10; B65D2577/20; B65D2577/2025; B65D2577/2033; B65D2577/2041; B65D2577/205; B65D2577/2066; B65D2577/2075; B65D2577/2083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A multilayer container comprising a multilayer structure shaped to define a container portion having an opening and a flange portion surrounding the opening, said flange portion including a planar portion arranged adjacent to said opening for producing an easily openable packaging container by heat sealing a lid member to said multilayer container on said flange portion, which multilayer structure comprises at least a peelable surface layer and a layer contacting the peelable surface layer, one of said peelable surface layer and said layer contacting the peelable surface layer being (A) a resin mixture layer comprising a polypropylene base resin and a polyethylene base resin, wherein the weight ratio between the polypropylene base resin and the polyethylene base resin in the resin mixture layer ranges from 50:50 to 97:3, the other being (B) a polyethylene layer, and the interlaminar strength between the said two layers being adjusted to not more than 1.5 kg/15 mm so that the opening of said packaging container begins with delamination between the said two layers.
Claim 2
Dependent Claim
169 words
A multilayer container comprising a multilayer structure shaped to define a container portion having an opening and a flange portion surrounding the opening, said flange portion including a planar portion arranged adjacent to said opening for producing an easily openable packaging container by heat sealing a lid member to said multilayer container on said flange portion, which multilayer structure comprises at least a peelable surface layer and a layer contacting the peelable surface layer, one of said peelable surface layer and said layer contacting the peelable surface layer being (A) a resin mixture layer comprising a polypropylene base resin and a polyethylene base resin, wherein the weight ratio between the polypropylene base resin and the polyethylene base resin in the resin mixture layer ranges from 50:50 to 97:3, the other being (B) a polyethylene layer, and the interlaminar strength between the said two layers being adjusted to not more than 1.5 kg/15 mm so that the opening of said packaging container begins with delamination between the said two layers.
Claim 3
Dependent Claim
17 words
A multilayer container according to claim 1, wherein said polyethylene layer (B) is a high density polyethylene.
Claim 4
Dependent Claim
31 words
A multilayer container according to claim 1, wherein said peelable surface layer is the polyethylene layer (B) and said layer contacting the peelable surface layer is the resin mixture layer (A).
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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) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |