US3764644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a protrusion on a blow molded article
Assignee: Phillips Petroleum Co
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Filing: 1971-04-30
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Granted: 1973-10-09
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Expires: 1991-04-30
Abstract
Abstract A method for blow molding an article having a necked portion or protrusion extending from the article. A plunger member moves a portion of a plasticized parison in a first direction while exerting a fluid force on the parison for blow molding said parison and then moves the portion of the parison in a second opposed direction while exerting said fluid force for forming a necked portion or protrusion having walls of substantially uniform thickness.
Inventors
- 👤 L Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:40
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/54; B29C2049/542; B29C2049/546
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
201 words
A method for forming a protusion on an article being blow molded in a mold from a plastic parison so that the walls of said protrusion are of a substantially uniform thickness, comprising: moving a portion of the parison within a mold, in a first direction relative to the other portions of the parison to a first position by exerting pressure on the outer surface of the parison with a movable part of the mold at the location of the desired protrusion while exerting a fluid force on an inner surface of the parison to conform the parison to the shape defined by the movable mold part while said parison is in a plasticized condition; moving the parison portion within the mold in a second direction opposed to the first direction to a second position by moving the movable mold part of the mold in said second direction while exerting a fluid force on the inner surface of the parison sufficient to conform the parison to the shape defined by the movable mold part while said parison is in a plasticized condition; and maintaining the parison portion and the fluid force until said parison sufficiently sets to hold the molded shape.
Claim 2
Independent Claim
201 words
A method for forming a protusion on an article being blow molded in a mold from a plastic parison so that the walls of said protrusion are of a substantially uniform thickness, comprising: moving a portion of the parison within a mold, in a first direction relative to the other portions of the parison to a first position by exerting pressure on the outer surface of the parison with a movable part of the mold at the location of the desired protrusion while exerting a fluid force on an inner surface of the parison to conform the parison to the shape defined by the movable mold part while said parison is in a plasticized condition; moving the parison portion within the mold in a second direction opposed to the first direction to a second position by moving the movable mold part of the mold in said second direction while exerting a fluid force on the inner surface of the parison sufficient to conform the parison to the shape defined by the movable mold part while said parison is in a plasticized condition; and maintaining the parison portion and the fluid force until said parison sufficiently sets to hold the molded shape.
Claim 3
Dependent Claim
25 words
A method, as set forth in claim 1, wherein the fluid force exerted on the parison differs in magnitude during movement of the parison portion.
Claim 4
Dependent Claim
23 words
A method, as set forth in claim 1, wherein the first direction is in a direction inwardly toward an axis of a parison.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |