US3914366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a parison
Assignee: Phillips Petroleum Co
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Filing: 1973-03-05
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Granted: 1975-10-21
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Expires: 1993-03-05
Abstract
Abstract A method for passing blow-moldable plastic material through an annulus of a die for forming a parison adapted for forming a molded article of substantially uniform wall thickness. During forming of the material in the die, first and second areas of increased wall thickness are formed on the material, the thickened portions only are thereafter progressively decreased in thickness to form a uniform cross-section and thereafter the material is discharged from the die.
Inventors
- 👤 Newton R Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:34
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/001; B29C48/0017; B29C48/03; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
A MOTHOD FOR FORMING A PARISON SUITABLE FOR BLOW-MOLDING A HOLLOW ARTICLE HAVING A SUBSTANTIALLY UNIFORM WALL THICKNESS SAID PARISON HAVING CONTINUOUS PORTIONS OF ENLARGED THICKNESS DIAMETRICALLY OPPOSED AND SUBSTANTIALLY FREE OF TWISTED SPACING ALONG THE LENGTH OF SAID PARISON, SAID METHOD COMPRISING FORMING A BLOW-MOLDABLE PLASTIC MATERIAL INTO A FIRST GENERALLY CYLINDRICAL CROSS-SECTION BY CONTINUOUSLY INJECTING SAID MATERIAL INTO A DIE HAVING INNER AND OUTER WALLS AND THEREAFTER
Claim 2
Dependent Claim
69 words
A MOTHOD FOR FORMING A PARISON SUITABLE FOR BLOW-MOLDING A HOLLOW ARTICLE HAVING A SUBSTANTIALLY UNIFORM WALL THICKNESS SAID PARISON HAVING CONTINUOUS PORTIONS OF ENLARGED THICKNESS DIAMETRICALLY OPPOSED AND SUBSTANTIALLY FREE OF TWISTED SPACING ALONG THE LENGTH OF SAID PARISON, SAID METHOD COMPRISING FORMING A BLOW-MOLDABLE PLASTIC MATERIAL INTO A FIRST GENERALLY CYLINDRICAL CROSS-SECTION BY CONTINUOUSLY INJECTING SAID MATERIAL INTO A DIE HAVING INNER AND OUTER WALLS AND THEREAFTER
Claim 3
Dependent Claim
18 words
FORMING SAID MATERIAL THROUGH A FIRST PORTION OF SAID DIE TO FORM A CROSS-SECTION OF UNIFORM WALL THICKNESS
Claim 4
Dependent Claim
18 words
FORMING SAID MATERIAL THROUGH A FIRST PORTION OF SAID DIE TO FORM A CROSS-SECTION OF UNIFORM WALL THICKNESS
Claim 5
Dependent Claim
27 words
PASSING SAID MATERIAL THROUGH A SECOND PORTION OF THE DIE THEREBY PROGRESSIVELY ENLARGING THE THICKNESS OF FIRST AND SECOND DIAMETRICALLY OPPOSED PORTIONS OF THE CROSS-SECTION AND THEN
Claim 6
Dependent Claim
27 words
PASSING SAID MATERIAL THROUGH A SECOND PORTION OF THE DIE THEREBY PROGRESSIVELY ENLARGING THE THICKNESS OF FIRST AND SECOND DIAMETRICALLY OPPOSED PORTIONS OF THE CROSS-SECTION AND THEN
Claim 7
Dependent Claim
27 words
passing said material through a second portion of the die thereby progressively enlarging the thickness of first and second diametrically opposed portions of the cross-section and then
Claim 8
Dependent Claim
27 words
passing said material through a second portion of the die thereby progressively enlarging the thickness of first and second diametrically opposed portions of the cross-section and then
Claim 9
Dependent Claim
45 words
A method, as set forth in claim 1, wherein the largest wall thickness of the enlarged portions of the cross-section are each in the range of about 0.5 percent to about 10 percent greater than the wall thickness of the smallest thickness of the parison.
Claim 10
Dependent Claim
29 words
A method, as set forth in claIm 1, wherein the enlarged portions of the cross-section each form in the range of about 90* to about 180* of the parison.
Claim 11
Dependent Claim
60 words
passing said material through a third portion of the die thereby, progressively decreasing said thickness of said enlarged portions to form a further cross-section of uniform wall thickness, and then discharging said material from the die thereby forming a parison comprising continuous portions of enlarged thickness diametrically opposed and substantially free of twisted spacing along the length of said parison.
Claim 12
Dependent Claim
60 words
passing said material through a third portion of the die thereby, progressively decreasing said thickness of said enlarged portions to form a further cross-section of uniform wall thickness, and then discharging said material from the die thereby forming a parison comprising continuous portions of enlarged thickness diametrically opposed and substantially free of twisted spacing along the length of said parison.
Claim 13
Dependent Claim
59 words
PASS SAID MATERIAL THROUGH A THIRD PORTION OF THE DIE THEREBY, PROGRESSIVELY DECREASING SAID THICKNESS OF SAID ENLARGED PORTIONS TO FORM A FURTHER CROSS-SECTION OF UNIFORM WALL THICKNESS, AND THEN DISCHARGING SAID MATERIAL FROM THE DIE THEREBY FORMING PARISON COMPRISING CONTINUOUS PORTIONS OF ENLARGED THICKNESS DIAMETRICALLY OPPOSED AND SUBSTANTIALLY FREE OF TWISTED SPACING ALONG TH LENGTH OF SAID PARISON.
Claim 14
Dependent Claim
59 words
PASS SAID MATERIAL THROUGH A THIRD PORTION OF THE DIE THEREBY, PROGRESSIVELY DECREASING SAID THICKNESS OF SAID ENLARGED PORTIONS TO FORM A FURTHER CROSS-SECTION OF UNIFORM WALL THICKNESS, AND THEN DISCHARGING SAID MATERIAL FROM THE DIE THEREBY FORMING PARISON COMPRISING CONTINUOUS PORTIONS OF ENLARGED THICKNESS DIAMETRICALLY OPPOSED AND SUBSTANTIALLY FREE OF TWISTED SPACING ALONG TH LENGTH OF SAID PARISON.
Claim 15
Dependent Claim
40 words
A method, as set forth in claim 1, including after decreasing the enlarged thicknesses to form the further cross-section of uniform wall thickness progressively enlarging the median diameter of the further cross-section prior to discharging said parison from the die.
References Cited (Backward Citations)
US3280847A
Cited
US3309443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |