US4277435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic tumbler and method and apparatus for making same
Assignee: Logic Devices Inc
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Filing: 1979-03-28
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Granted: 1981-07-07
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Expires: 1999-03-28
Abstract
Abstract A tumbler is formed of injected plastic material that has different directional strengths by injecting the plastic material somewhat tangentially to cause the plastic material to move peripherally in the rim defining portion of the mold cavity in order to have the weaker directional strength also extend peripherally to thereby increase the tumbler's resistance to lengthwise splitting from the rim to the bottom and in which the mold is vented into a cooling passageway.
Inventors
- 👤 Paul E. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:49
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/72; B29C45/73; B29C45/26; B29C45/27; B29C45/2701; B29C45/2708; B29C45/34; B29C45/345
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A method for molding a plastic container having a closed bottom, a circular wall extending upwardly therefrom and a top circular rim on said wall comprising the steps of forming a closed mold cavity defining the shape of said plastic container, injecting plastic material into said cavity in a common direction at a plurality of spaced points at least adjacent the rim-forming portion of the cavity and at an angle substantially tangential thereto to fill the rim-forming portion with a peripheral circular movement of said plastic material and cause said plastic material to swirl around and down into the side wall-forming portion of the cavity towards and into the bottom-forming portion of the cavity while evacuating at least some of the gas present in the cavity through the bottom-forming portion of the cavity, to form a plastic container having improved strength due to the plastic material in the rim and wall thereof having been introduced in a circular swirl pattern.
Claim 2
Independent Claim
160 words
A method for molding a plastic container having a closed bottom, a circular wall extending upwardly therefrom and a top circular rim on said wall comprising the steps of forming a closed mold cavity defining the shape of said plastic container, injecting plastic material into said cavity in a common direction at a plurality of spaced points at least adjacent the rim-forming portion of the cavity and at an angle substantially tangential thereto to fill the rim-forming portion with a peripheral circular movement of said plastic material and cause said plastic material to swirl around and down into the side wall-forming portion of the cavity towards and into the bottom-forming portion of the cavity while evacuating at least some of the gas present in the cavity through the bottom-forming portion of the cavity, to form a plastic container having improved strength due to the plastic material in the rim and wall thereof having been introduced in a circular swirl pattern.
Claim 3
Dependent Claim
53 words
The invention as defined in claim 1 in which there is the step of cooling the mold by flowing a cooling liquid therein under a negative pressure and in which the step of evacuating the gases from the mold cavity includes directing at least some of the gases into the cooling liquid passageway.
Claim 4
Dependent Claim
42 words
The invention as defined in claim 1 in which the step of injecting further includes spacing the injecting points essentially evenly about the cavity and in which the direction of the injected plastic material is essentially the same for each injecting point.
Claim 5
Dependent Claim
28 words
The invention as defined in claim 3 in which the step of injecting injects the plastic material substantially tangentially directly into the rim forming portion of the cavity.
Claim 6
Dependent Claim
44 words
The invention as defined in claim 3 in which the step of injecting injects the plastic material substantially tangentially into the side wall forming portion of the cavity adjacent the rim forming portion with an inclination towards the bottom forming portion of the cavity.
References Cited (Backward Citations)
US2199144A
Cited
US2372177A
Cited
FR1288393A
Cited
US3247550A
Cited
US3907952A
Cited
US3626051A
Cited
US3975494A
Cited
US4091069A
Cited
US4177238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |