Patent US3277224A successfully refreshed from Google Patents.
US3277224A
Expired / Lapsed
US
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Method of thermoforming
Assignee: Poly-Pak Corp of America
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Filing: 1963-04-05
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Granted: 1966-10-04
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Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 Carlton L Whiteford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:25
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C55/143; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; F02M35/02475; F02M35/02483; F02M35/12; F02M35/1205; F02M35/1255; F02M35/1266; F02M35/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
IN THE METHOD OF FABRICATING AN ARTICLE OF BIAXIALLY ORIENTED POLYSTYRENE FROM MONAXIALLY ORIENTED POLYSTYRENE SHEET MATERIAL, THE STEPS COMPRISING PROVIDING A ROLL OF POLYSTYRENE SHEET MATERIAL WHICH HAS BEEN PREORIENTED IN THE LONGITUDINAL DIRECTION AND IS SUBSTANTIALLY UNORIENTED IN THE TRANSVERSE DIRECTION SAID ROLL BEING AT A TEMPERATURE BELOW THE TEMPERATURE AT WHICH SAID SHEET MATERIAL WAS LONGITUDINALLY ORIENTED; UNCOILING AND SEVERING A GENERALLY RECTANGULAR LENGTH FROM SAID ROLL OF SHEET MATERIAL; INTRODUCING HEAT SUBSTANTIALLY UNIFORMLY INTO SAID LENGTH OF SHEET MATERIAL WHILE SUBSTANTIALLY PREVENTING LOSS OF ORIENTATION IN THE LONGITUDINAL DIRECTION; STRETCHING SAID HEATED LENGTH OF SHEET MATERIAL IN THE TRANSVERSE DIRECTION SUFFICIENTLY TO EFFECT SUBSTANTIAL MOLECULAR ORIENTATION IN THE TRANSVERSE DIRECTION AND THEREBY TO PRODUCE BIAXIAL ORIENTATION OF SAID LENGTH; AND THEREAFTER THERMOFORMING SAID BIAXIALLY ORIENTED LENGTH OF SHEET MATERIAL WHILE MAINTAINING A PORTION OF THE HEAT PROVIOUSLY INTRODUCTED THERINTO AND GRIPPING THE EDGES THEREOF TO PREVENT LOSS OF ORIENTATION.
Claim 2
Dependent Claim
153 words
IN THE METHOD OF FABRICATING AN ARTICLE OF BIAXIALLY ORIENTED POLYSTYRENE FROM MONAXIALLY ORIENTED POLYSTYRENE SHEET MATERIAL, THE STEPS COMPRISING PROVIDING A ROLL OF POLYSTYRENE SHEET MATERIAL WHICH HAS BEEN PREORIENTED IN THE LONGITUDINAL DIRECTION AND IS SUBSTANTIALLY UNORIENTED IN THE TRANSVERSE DIRECTION SAID ROLL BEING AT A TEMPERATURE BELOW THE TEMPERATURE AT WHICH SAID SHEET MATERIAL WAS LONGITUDINALLY ORIENTED; UNCOILING AND SEVERING A GENERALLY RECTANGULAR LENGTH FROM SAID ROLL OF SHEET MATERIAL; INTRODUCING HEAT SUBSTANTIALLY UNIFORMLY INTO SAID LENGTH OF SHEET MATERIAL WHILE SUBSTANTIALLY PREVENTING LOSS OF ORIENTATION IN THE LONGITUDINAL DIRECTION; STRETCHING SAID HEATED LENGTH OF SHEET MATERIAL IN THE TRANSVERSE DIRECTION SUFFICIENTLY TO EFFECT SUBSTANTIAL MOLECULAR ORIENTATION IN THE TRANSVERSE DIRECTION AND THEREBY TO PRODUCE BIAXIAL ORIENTATION OF SAID LENGTH; AND THEREAFTER THERMOFORMING SAID BIAXIALLY ORIENTED LENGTH OF SHEET MATERIAL WHILE MAINTAINING A PORTION OF THE HEAT PROVIOUSLY INTRODUCTED THERINTO AND GRIPPING THE EDGES THEREOF TO PREVENT LOSS OF ORIENTATION.
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |