Patent US3493493A successfully refreshed from Google Patents.
US3493493A
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US
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Process for enhancing lubricating oils and a catalyst for use in the process
Assignee: Gulf Research and Development Co
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Filing: 1968-10-01
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Granted: 1970-02-03
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Expires: 1988-10-01
Abstract
No abstract record available.
Inventors
- 👤 Alfred Henke
- 👤 William A Horne
- 👤 Bruce K Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:45
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; C; C10; C10G; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3078238A
Cited
US3046218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |