Patent US3142545A successfully refreshed from Google Patents.
US3142545A
Expired / Lapsed
US
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System for hydrotreating of hydrocarbons
Assignee: Shell USA Inc
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Filing: 1961-03-24
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Granted: 1964-07-28
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Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
- 👤 Walter P Raarup
- 👤 Helen J Peery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:45
CPC Classifications
C; C10; C10G; C10G49/00; C10G49/02; C10G49/06; C10G35/00; C10G35/04; C10G35/06; C10G35/085
Claims Analysis
Total Claims: 0
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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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |