US3758654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
T collapse against an adjoining wall of the article method for blow molding an article having a tail portion which can no
Assignee: Innopak Plastics Corp
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Filing: 1971-10-14
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Granted: 1973-09-11
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Expires: 1991-10-14
Abstract
Abstract Method for preventing a tail portion of a blow molded article from collapsing against an adjoining wall of the article. Recesses in the walls defining the relief cavity within which the tail is shaped as the mold is closed form protrusions on both sides of the tail adjacent the adjoining wall which may be the article base, these protrusions coacting with the wall after opening the mold to prop the tail portion away from the wall and preferably maintain it in an erect position.
Inventors
- 👤 L Martino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:50
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/4802; B29C49/4817
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
In forming a hollow article by closing opposing sections of a blow mold on a thermoplastic parison, said closing causing collapse of a portion of said parison to form a waste tail portion, blowing an uncollapsed portion of said parison to form the article, moving said sections away from each other to open said mold without separating the tail portion from attachment with the blown article and then severing said tail portion from the article downstream of the mold the improvement which comprises forming supporting protrusions on both sides of said tail portion within recesses in said mold sections during closing of said mold sectiOns, said recesses being shaped to allow release of said protrusions therefrom during opening of said mold sections so that said tail portion and protrusions remain attached to said article, and allowing the tail portion to pivot about its connection with an adjacent wall of the blown article after opening said mold to bring said protrusions into temporary abutment with said wall to keep the surface of the tail portion spaced from said wall prior to said severing.
Claim 2
Dependent Claim
182 words
In forming a hollow article by closing opposing sections of a blow mold on a thermoplastic parison, said closing causing collapse of a portion of said parison to form a waste tail portion, blowing an uncollapsed portion of said parison to form the article, moving said sections away from each other to open said mold without separating the tail portion from attachment with the blown article and then severing said tail portion from the article downstream of the mold the improvement which comprises forming supporting protrusions on both sides of said tail portion within recesses in said mold sections during closing of said mold sectiOns, said recesses being shaped to allow release of said protrusions therefrom during opening of said mold sections so that said tail portion and protrusions remain attached to said article, and allowing the tail portion to pivot about its connection with an adjacent wall of the blown article after opening said mold to bring said protrusions into temporary abutment with said wall to keep the surface of the tail portion spaced from said wall prior to said severing.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the tail portion and the article are made of a vinyl based thermoplastic.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the adjoining wall is the base of the article.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |