Patent US2976253A successfully refreshed from Google Patents.
US2976253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of catalyst
Assignee: Phillips Petroleum Co
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Filing: 1958-10-10
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Granted: 1961-03-21
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Expires: 1978-10-10
Abstract
No abstract record available.
Inventors
- 👤 Oliver D Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:45
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J37/0018; B01J33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METHOD OF PROTECTING A PELLETED DEHYDROGENATION CATALYST FROM MOISTURE AND ATTRITION DURING HANDLING WHICH COMPRISES COATING EACH CATALYST PELLET WITH A THIN, CONTINUOUS FILM OF A NORMALLY SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND COPOLYMERS OF ETHYLENE WILTH AT LEAST ONE MONOOLEFIN HAVING FROM 3 TO 4 CARBON ATOMS PER MOLECULE.
Claim 2
Independent Claim
55 words
A METHOD OF PROTECTING A PELLETED DEHYDROGENATION CATALYST FROM MOISTURE AND ATTRITION DURING HANDLING WHICH COMPRISES COATING EACH CATALYST PELLET WITH A THIN, CONTINUOUS FILM OF A NORMALLY SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND COPOLYMERS OF ETHYLENE WILTH AT LEAST ONE MONOOLEFIN HAVING FROM 3 TO 4 CARBON ATOMS PER MOLECULE.
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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |