Patent US3316231A successfully refreshed from Google Patents.
US3316231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracking of high molecular weight ethylene polymers and resulting products
Assignee: Phillips Petroleum Co
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Filing: 1955-12-30
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Granted: 1967-04-25
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Expires: 1975-12-30
Abstract
No abstract record available.
Inventors
- 👤 Peter J Canterino
- 👤 Major L Gallaugher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:35
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS WHICH COMPRISES THERMALLY DECOMPOSING A CRYSTALLINE POLYPROPYLENE BY HEATING SAID POLYPROPYLENE TO A TEMPERATURE IN THE RANGE OF 600 TO 900*F. FOR A PERIOD LESS THAN 30 MINUTES, IN AN INERT ATMOSPHERE AT A PRESSUSRE NOT GREATER THAN ATMOSPHERIC PRESSURE AND RECOVERING THE PRODUCT OF SAID THERMAL DECOMPOSITION.
Claim 2
Dependent Claim
50 words
A PROCESS WHICH COMPRISES THERMALLY DECOMPOSING A CRYSTALLINE POLYPROPYLENE BY HEATING SAID POLYPROPYLENE TO A TEMPERATURE IN THE RANGE OF 600 TO 900*F. FOR A PERIOD LESS THAN 30 MINUTES, IN AN INERT ATMOSPHERE AT A PRESSUSRE NOT GREATER THAN ATMOSPHERIC PRESSURE AND RECOVERING THE PRODUCT OF SAID THERMAL DECOMPOSITION.
References Cited (Backward Citations)
US2367173A
Cited
US2372001A
Cited
GB569043A
Cited
US2436069A
Cited
US2480615A
Cited
US2692258A
Cited
US2758100A
Cited
US2706719A
Cited
US2726231A
Cited
US2882246A
Cited
US2835659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |