US3337664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming thermoplastic articles of unusual configuration
Assignee: Illinois Tool Works Inc
•
Filing: 1965-05-05
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Granted: 1967-08-22
•
Expires: 1985-05-05
Abstract
No abstract record available.
Inventors
- 👤 Wayne B Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:16
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A METHOD OF FORMING AN UNDERCUT IN AN PLASTIC ARTICLE COMPRISING THE STEPS OF HEATING A WEB OF THERMOPLASTIC MATERIAL TO ITS FORMING TEMPERATURE, CREATING A FIRST PRESSURE DIFFERENTIAL ACROSS A PREDETERMINED AREA OF SAID WEB TO DRAW MATERIAL IN A FIRST DIRECTION, MAINTAINING AT LEAST A PORTION OF SAID DRAWN MATERIAL IN A SUBSTANTIALLY FIXED POSITION BY SAID FIRST PRESSURE DIFFERENTIAL, AND CREATING A SECOND PRESSURE DIFFERENTIAL ACROSS OTHER PREDETERMINED AREAS OF SAID WEB LYING OUTSIDE OF THE FIXED MATERIAL PORTION WHICH IS GREATER THAN SAID FIRST PRESSURE DIFFERENTIAL TO DRAW MATERIAL IN A SECOND DIRECTION WHICH IS SUBSTANTIALLY NORMAL TO SAID FIRST DIRECTION LEAVING THE FIXED MATERIAL PORTION UNAFFECTED TO CAUSE AT LEAST A PORTION OF SAID OTHER PREDETERMINED AREAS TO FOLD UNDER SAID FIXED MATERIAL AREA AND PROVIDE THE UNDERCUT ON AN ARTICLE.
Claim 2
Independent Claim
136 words
A METHOD OF FORMING AN UNDERCUT IN AN PLASTIC ARTICLE COMPRISING THE STEPS OF HEATING A WEB OF THERMOPLASTIC MATERIAL TO ITS FORMING TEMPERATURE, CREATING A FIRST PRESSURE DIFFERENTIAL ACROSS A PREDETERMINED AREA OF SAID WEB TO DRAW MATERIAL IN A FIRST DIRECTION, MAINTAINING AT LEAST A PORTION OF SAID DRAWN MATERIAL IN A SUBSTANTIALLY FIXED POSITION BY SAID FIRST PRESSURE DIFFERENTIAL, AND CREATING A SECOND PRESSURE DIFFERENTIAL ACROSS OTHER PREDETERMINED AREAS OF SAID WEB LYING OUTSIDE OF THE FIXED MATERIAL PORTION WHICH IS GREATER THAN SAID FIRST PRESSURE DIFFERENTIAL TO DRAW MATERIAL IN A SECOND DIRECTION WHICH IS SUBSTANTIALLY NORMAL TO SAID FIRST DIRECTION LEAVING THE FIXED MATERIAL PORTION UNAFFECTED TO CAUSE AT LEAST A PORTION OF SAID OTHER PREDETERMINED AREAS TO FOLD UNDER SAID FIXED MATERIAL AREA AND PROVIDE THE UNDERCUT ON AN ARTICLE.
Claim 3
Dependent Claim
97 words
APPARATUS FOR MOLDING UNDERCUTS IN ARTICLES FROM A HEATED WEB OF PLASTIC MATERIAL COMPRISING FIRST FLUID PRESSURE MEANS FOR DRAWING A PREDETERMINED AREA OF MATERIAL IN A FIRST DIRECTION AND MAINTAINING AT LEAST A PORTION OF SAID DRAWN MATERIAL IN A SUBSTANTIALLY FIXED POSITION, AND SECOND FLUID PRESSURE MEANS GREATER THAN SAID FIRST FLUID PRESSURE MEANS FOR DRAWING OTHER PREDETERMINED AREAS OF SAID WEB LYING OUTSIDE OF THE FIXED MATERIAL PORTION IN A SECOND DIRECTION EXTENDING SUBSTANTIALLY NORMAL TO SAID FIRST DIRECTION TO CAUSE MATERIAL TO BE DRAWN UNDERNEATH SAID FIXED MATERIAL PORTION AND PROVIDE AN UNDERCUT.
Claim 4
Dependent Claim
97 words
APPARATUS FOR MOLDING UNDERCUTS IN ARTICLES FROM A HEATED WEB OF PLASTIC MATERIAL COMPRISING FIRST FLUID PRESSURE MEANS FOR DRAWING A PREDETERMINED AREA OF MATERIAL IN A FIRST DIRECTION AND MAINTAINING AT LEAST A PORTION OF SAID DRAWN MATERIAL IN A SUBSTANTIALLY FIXED POSITION, AND SECOND FLUID PRESSURE MEANS GREATER THAN SAID FIRST FLUID PRESSURE MEANS FOR DRAWING OTHER PREDETERMINED AREAS OF SAID WEB LYING OUTSIDE OF THE FIXED MATERIAL PORTION IN A SECOND DIRECTION EXTENDING SUBSTANTIALLY NORMAL TO SAID FIRST DIRECTION TO CAUSE MATERIAL TO BE DRAWN UNDERNEATH SAID FIXED MATERIAL PORTION AND PROVIDE AN UNDERCUT.
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US2973558A
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US3105607A
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US3244780A
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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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |