US3370112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for producing plastic memory articles
Assignee: Raychem Corp
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Filing: 1963-09-26
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Granted: 1968-02-20
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Expires: 1983-09-26
Abstract
No abstract record available.
Inventors
- 👤 Wray Pierre Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:53
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/003; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C61/06; B29C61/08; B29C48/885; B29C48/905; B29C48/908; B29C48/91; B29C48/911; B29C48/9115; B29C48/912; B29C48/9135; B29C48/919
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A PROCESS FOR THE PRODUCTION OF HEAT-SHRINKABLE TUBING HAVING A PREDETERMINED DIAMETER FORM AN EXTRUDED TUBE OF CRYSTALLINE POLYMERIC MATERIALS, SAID MATERIAL EXHIBITING ELASTOMERIC PROPERTIES EHEN HEATE TO A TEMPERAURE AT LEAST EQUAL TO ITS CRYSTALLINE MELTING TEMPERATURE, SAID PROCESS COMPRISING HEATING SAID TUBE TO A TEMPERATURE AT LEAST EQUAL TO THE CRYSTALLINE MELTING TEMPERATURE OF SAID MATERIAL, SIAD HEATING STEP BEING CARRIED OUT WITH THE EXTERIOR OF THE TUBE EXPOSED TO ATMOSPHERIC PRESSURE, ESTABLISHING A PRESSURE DIFFERENT BETWEEN THE INSIDE AND OUTSIDE OF SIAD TUBE BY IMPOSING A PARTIAL VACUUM ON THE EXTERIOR OF THE TUBE, SIAD PRESSURE DIFFERENTIAL BING LESS THAN THAT REQUIRED TO EXPAND THE TUBE TO THE FINAL PRODETERMINED DIAMETER WHILE IT IS AT SAID TEMPERATURE, BUT BEING SUFFICIENT TO EXPAND THE TUBE TO THE FINAL PREDETERMINED DIAMETER UPON COOLING THE TUBE TO A TEMPERATURE BELOW SAID CRYSTALLINE MELTING TEMPERATURE, AND COOLING THE TUBE TO A TEMPERATUE BELOW SIAD CRYSTALLINE MELTING TEMPERATURE WHILE CONTINUING TO MAINTAIN SAID PRESSURE DIFFERENTIAL UNTIL SAID TUBE IS SEET AT THE DESIRED PREDETERMINED EXPANDED DIAMETER.
Claim 2
Dependent Claim
174 words
A PROCESS FOR THE PRODUCTION OF HEAT-SHRINKABLE TUBING HAVING A PREDETERMINED DIAMETER FORM AN EXTRUDED TUBE OF CRYSTALLINE POLYMERIC MATERIALS, SAID MATERIAL EXHIBITING ELASTOMERIC PROPERTIES EHEN HEATE TO A TEMPERAURE AT LEAST EQUAL TO ITS CRYSTALLINE MELTING TEMPERATURE, SAID PROCESS COMPRISING HEATING SAID TUBE TO A TEMPERATURE AT LEAST EQUAL TO THE CRYSTALLINE MELTING TEMPERATURE OF SAID MATERIAL, SIAD HEATING STEP BEING CARRIED OUT WITH THE EXTERIOR OF THE TUBE EXPOSED TO ATMOSPHERIC PRESSURE, ESTABLISHING A PRESSURE DIFFERENT BETWEEN THE INSIDE AND OUTSIDE OF SIAD TUBE BY IMPOSING A PARTIAL VACUUM ON THE EXTERIOR OF THE TUBE, SIAD PRESSURE DIFFERENTIAL BING LESS THAN THAT REQUIRED TO EXPAND THE TUBE TO THE FINAL PRODETERMINED DIAMETER WHILE IT IS AT SAID TEMPERATURE, BUT BEING SUFFICIENT TO EXPAND THE TUBE TO THE FINAL PREDETERMINED DIAMETER UPON COOLING THE TUBE TO A TEMPERATURE BELOW SAID CRYSTALLINE MELTING TEMPERATURE, AND COOLING THE TUBE TO A TEMPERATUE BELOW SIAD CRYSTALLINE MELTING TEMPERATURE WHILE CONTINUING TO MAINTAIN SAID PRESSURE DIFFERENTIAL UNTIL SAID TUBE IS SEET AT THE DESIRED PREDETERMINED EXPANDED DIAMETER.
Claim 3
Dependent Claim
30 words
THE PROCESS OF CLAIM 1, WHEREIN SIAD CRYSTALLINE POLYMERIC MATEIAL IS PRODUCED BY CORSS-LINKING A CRYSTALLINE POLYMER BY MEANS EQUIVALENT TO AN IRRADIATION DOSE OF AT LEAST ABOUT 2X10*6 RADS.
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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |