Patent US3520796A successfully refreshed from Google Patents.
US3520796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making lubricating oils by hydrotreating and dewaxing
Assignee: Gulf Research and Development Co
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Filing: 1968-08-21
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Granted: 1970-07-14
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Expires: 1988-08-21
Abstract
No abstract record available.
Inventors
- 👤 Harry C Murphy Jr
- 👤 James R Murphy
- 👤 Harry C Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:39
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/04; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2787582A
Cited
US3012963A
Cited
US3142634A
Cited
US3285848A
Cited
US3318800A
Cited
US3293173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |