Patent US2633622A successfully refreshed from Google Patents.
US2633622A
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Stabilized alumina pebbles
Assignee: Phillips Petroleum Co
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Filing: 1948-10-08
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Granted: 1953-04-07
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Expires: 1968-10-08
Abstract
No abstract record available.
Inventors
- 👤 Sam P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; B; B01; B01J; B01J21/00; F; F28; F28D; F28D20/00; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
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
Claim 2
Dependent Claim
124 words
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
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) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |