US3316231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracking of high molecular weight ethylene polymers and resulting products
Assignee: Phillips Petroleum Co
•
Filing: 1955-12-30
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Granted: 1967-04-25
•
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 00:50
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.
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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 |