US4797244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiwalled container and method of making same
Assignee: Pechiney Plastic Packaging Inc
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Filing: 1984-08-23
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Granted: 1989-01-10
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Expires: 2004-08-23
Abstract
Abstract A multiwalled plastic container and method for making the same is disclosed having a barrier liner and an outer wall providing structural support for the liner. The container provides increased protection against separation of the liner and structural wall especially at the rim defining the opening of the container. This is accomplished by a wrap around liner lip construction wherein the liner extends from the inside surface of the structural wall around the top rim surface of the wall and downwardly depends therefrom along the outer surface of the structural wall. To downwardly depending leg of the liner lip is recessed within the outer wall surface providing adding protection against liner separation.
Inventors
- 👤 Donald G. Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:13
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/1418; B29C45/14196; B29C51/00; B29C51/26; B29C51/30; B29C51/32; B29C51/325; B29C70/00; B29C70/68; B29C70/681; B29C70/683; B29D; B29D22/00; B29D22/003; B65; B65D; B65D25/00; B65D25/14; B29C2045/14237; B29C2949/00; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3032; B29K; B29K2995/00; B29K2995/0037; B29K2995/0065; B29K2995/0067; B29L; B29L2031/00; B29L2031/712; B29L2031/7158; B29L2031/716
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
A method of producing a multiwalled plastic container having a first wall means and a second wall means comprising: providing a pre-formed thermo-plastic hollow first wall means, said first wall means having a sidewall having an inner and outer surface and defining an opening, said first wall means also having circumferentially-extending lip about said opening, said lip forming an acute angle with said sidewall to provide a trough-like region; placing said first wall means in an injection-mold cavity having a molding surface to thereby provide a space between first wall means and said molding surface; injecting a molten plastic material into said space to form said second wall means, said injected plastic entering the trough-like region and re-forming the configuration of said lip, said injected plastic material forming a circumferential rim on said second wall means defining an opening and said injected plastic material forcing said lip against said molding surface to re-form said lip to wrap over and around said rim of said second wall means; and, removing said first and second wall means from said molding cavity.
Claim 2
Independent Claim
179 words
A method of producing a multiwalled plastic container having a first wall means and a second wall means comprising: providing a pre-formed thermo-plastic hollow first wall means, said first wall means having a sidewall having an inner and outer surface and defining an opening, said first wall means also having circumferentially-extending lip about said opening, said lip forming an acute angle with said sidewall to provide a trough-like region; placing said first wall means in an injection-mold cavity having a molding surface to thereby provide a space between first wall means and said molding surface; injecting a molten plastic material into said space to form said second wall means, said injected plastic entering the trough-like region and re-forming the configuration of said lip, said injected plastic material forming a circumferential rim on said second wall means defining an opening and said injected plastic material forcing said lip against said molding surface to re-form said lip to wrap over and around said rim of said second wall means; and, removing said first and second wall means from said molding cavity.
Claim 3
Dependent Claim
39 words
The method of claim 1, wherein said reformation of said lip produces an edge which is embedded in said second wall means and having an outer surface that is flush with an adjacent surface of said second wall means.
Claim 4
Dependent Claim
18 words
The method of claim 1, wherein said acute angle is in the range of approximately 20° to 60°.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |