Patent US3244780A successfully refreshed from Google Patents.
US3244780A
Expired / Lapsed
US
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Differential heating and drawing of plastics
Assignee: Individual
•
Filing: 1962-06-29
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Granted: 1966-04-05
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 Levey John
- 👤 Pylant John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:22
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/04; B29C51/06; B29C51/26; B29C51/42; B29C51/421; B29C51/422; Y; Y10; Y10S; Y10S425/00; Y10S425/20; Y10S425/201
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD OF FORMING A HOT DUCTILE SHEET OF THERMOPLASTIC MATERIAL INTO A THREE-DIMENSIONAL SHEET COMPRISING THE STEPS OF: PLACING AN AREA OF THE MATERIAL ADJACENT TO THE MOUTH OF A CAVITY MOLD; FORMING THE MATERIAL AWAY FROM THE MOUTH OF THE CAVITY MOLD BY A PRESSURE DIFFERNTIAL INCLUDING FORCING THE CENTRAL PORTION OF THE SAID AREA OF MATERIAL AGAINST A YIELDABLE MEMBER TO FORM A HOLLOW MODULE THEREIN; HEATING THE SAID AREA OF THE MATERIAL AND HEATING THE SAID CENTRAL PORTION OF THE AREA TO A LESSER DEGREE; AND CHANGING THE PRESSURE DIFFERENTIAL IN ORDER TO FORM THE AREA OF MATERIAL INTO THE CAVITY MOLD WHEREBY THE HOT PERIPHERAL PORTIONS OF THE AREA WILL STRETCH FIRST AND BECOME COOLED BY THE WALLS OF THE CAVITY MOLD, WHEREBY THE BOTTOM AND LOWER SIDE WALLS OF THE CONTAINER FORMED ARE STRETCHED, TO PROVIDE WALLS OF CONTROLLED THICKNESS DISTRIBUTION.
Claim 2
Independent Claim
147 words
A METHOD OF FORMING A HOT DUCTILE SHEET OF THERMOPLASTIC MATERIAL INTO A THREE-DIMENSIONAL SHEET COMPRISING THE STEPS OF: PLACING AN AREA OF THE MATERIAL ADJACENT TO THE MOUTH OF A CAVITY MOLD; FORMING THE MATERIAL AWAY FROM THE MOUTH OF THE CAVITY MOLD BY A PRESSURE DIFFERNTIAL INCLUDING FORCING THE CENTRAL PORTION OF THE SAID AREA OF MATERIAL AGAINST A YIELDABLE MEMBER TO FORM A HOLLOW MODULE THEREIN; HEATING THE SAID AREA OF THE MATERIAL AND HEATING THE SAID CENTRAL PORTION OF THE AREA TO A LESSER DEGREE; AND CHANGING THE PRESSURE DIFFERENTIAL IN ORDER TO FORM THE AREA OF MATERIAL INTO THE CAVITY MOLD WHEREBY THE HOT PERIPHERAL PORTIONS OF THE AREA WILL STRETCH FIRST AND BECOME COOLED BY THE WALLS OF THE CAVITY MOLD, WHEREBY THE BOTTOM AND LOWER SIDE WALLS OF THE CONTAINER FORMED ARE STRETCHED, TO PROVIDE WALLS OF CONTROLLED THICKNESS DISTRIBUTION.
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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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |