Patent US3362897A successfully refreshed from Google Patents.
US3362897A
Expired / Lapsed
US
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Stable irradiated polyethylene
Assignee: General Electric Co
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Filing: 1962-11-21
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Granted: 1968-01-09
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Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 Elliott J Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:27
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/02; B29C71/04; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/065; B29K2995/00; B29K2995/0037; B29K2995/0041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE PROCESS OF STABILIZATING IRRADIATED POLYETHYLENE AGAINST OXIDATIVE ATTACK WHEN EXPOSED TO AN OXYGEN-CONTAINING ATMOSPHERE, DUE TO THE PRESENCE OF TRAPPED FREE RADICALS IN SAID POLYETHYLENE, WHICH COMPRISES (1) TREATING SOLID, CRYSTALLINE POLYETHYLENE WITH IONIZING RADIATION HAVING ENERGY EQUIVALENT TO AT LEAST 5X10**4 ELECTRON VOLTS TO A DOSE OF 1X10**6 TO 50X10**8 REP, THEREBY CREATING TRAPPED FREE RADICALS IN THE IRRADIATED POLYETHYLENE, (2) MINIMIZING CONTACT OF OXYGEN WITH THE IRRADIATED POLYETHYLENE CONTAINING TRAPPED FREE RADICALS BETWEEN THE TIME THE POLYETHYLENE IS IRRADIATED AND HEATED BY PROVIDING AN IRRADIATION ZONE AND A HEATING ZONE, AND PASSING THE POLYETHYLENE FROM THE IRRADIATION ZONE INTO THE HEATING ZONE WITHOUT INTERRUPTION, AND (3) HEATING THE IRRADIATED POLYETHYLENE TO A TEMPERATURE WHERE THE POLYETHYLENE IS IN A SOLID SUBSTANTIALLY AMORPHOURS STATE TO DESTROY SUBSTANTIALLY ALL OF THE RADIATION-INDUCED FREE RADICALS TRAPPED IN THE POLYETHLENE, BEFORE THEY REACT WITH OXYGEN.
Claim 2
Dependent Claim
144 words
THE PROCESS OF STABILIZATING IRRADIATED POLYETHYLENE AGAINST OXIDATIVE ATTACK WHEN EXPOSED TO AN OXYGEN-CONTAINING ATMOSPHERE, DUE TO THE PRESENCE OF TRAPPED FREE RADICALS IN SAID POLYETHYLENE, WHICH COMPRISES (1) TREATING SOLID, CRYSTALLINE POLYETHYLENE WITH IONIZING RADIATION HAVING ENERGY EQUIVALENT TO AT LEAST 5X10**4 ELECTRON VOLTS TO A DOSE OF 1X10**6 TO 50X10**8 REP, THEREBY CREATING TRAPPED FREE RADICALS IN THE IRRADIATED POLYETHYLENE, (2) MINIMIZING CONTACT OF OXYGEN WITH THE IRRADIATED POLYETHYLENE CONTAINING TRAPPED FREE RADICALS BETWEEN THE TIME THE POLYETHYLENE IS IRRADIATED AND HEATED BY PROVIDING AN IRRADIATION ZONE AND A HEATING ZONE, AND PASSING THE POLYETHYLENE FROM THE IRRADIATION ZONE INTO THE HEATING ZONE WITHOUT INTERRUPTION, AND (3) HEATING THE IRRADIATED POLYETHYLENE TO A TEMPERATURE WHERE THE POLYETHYLENE IS IN A SOLID SUBSTANTIALLY AMORPHOURS STATE TO DESTROY SUBSTANTIALLY ALL OF THE RADIATION-INDUCED FREE RADICALS TRAPPED IN THE POLYETHLENE, BEFORE THEY REACT WITH OXYGEN.
References Cited (Backward Citations)
US2929744A
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US2989451A
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US2940869A
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US2956899A
Cited
US2967137A
Cited
US3088791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |