Patent US3043480A successfully refreshed from Google Patents.
Patent US3252887A successfully refreshed from Google Patents.
US3252887A
Expired / Lapsed
US
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Electrical insulating oil
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1962-11-20
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Granted: 1966-05-24
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Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 Carl J Rizzuti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:32
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
AN OIL USEFUL AS AN ELECTRICAL INSULATING OIL CONSISTING ESSENTIALLY OF: (A) A BLEND OF 55 TO 90 VOL. PERCENT OF A HIGH TEMPERATURE HYDROFINED DISTILLATE HYDROFINEDAT A TEMPERATURE IN THE RANGE OF 630* TO Z670*F. AND BOILING IN THE RANGE OF 450* TO 900* F., AND (B) 45 TO 10 VOL. PERCENT OF A LOW TEMPERATURE HYDROFINED DISTILLATE HYDROFINED AT A TEMPERATURE IN THE RANGE OF 555* TO 595*F. AND BOILING IN THE RANGE OF 450* TO 900*F., (C) SAID HYDROFINED OILS BEING INDIVIDUALLY PREPARED BY CONTACTING A DISTILLATE FROM A NAPHTHENIC CRUDE WITH A HYDROFINING CATALYST AT A FEED RATE OF 1 TO 3 V./V./HOUR AND AT A PRESSURE OF 500 TO 900 P.S.I.G. IN THE PRESENCE OF FROM 200 TO 900 S.C.F./BBL. OF HYDROGEN FOLLOWED BY TREATING THE HYDROFINED DISTILLATE OILS WITH AN ABSORBENT CLAY.
Claim 2
Dependent Claim
138 words
AN OIL USEFUL AS AN ELECTRICAL INSULATING OIL CONSISTING ESSENTIALLY OF: (A) A BLEND OF 55 TO 90 VOL. PERCENT OF A HIGH TEMPERATURE HYDROFINED DISTILLATE HYDROFINEDAT A TEMPERATURE IN THE RANGE OF 630* TO Z670*F. AND BOILING IN THE RANGE OF 450* TO 900* F., AND (B) 45 TO 10 VOL. PERCENT OF A LOW TEMPERATURE HYDROFINED DISTILLATE HYDROFINED AT A TEMPERATURE IN THE RANGE OF 555* TO 595*F. AND BOILING IN THE RANGE OF 450* TO 900*F., (C) SAID HYDROFINED OILS BEING INDIVIDUALLY PREPARED BY CONTACTING A DISTILLATE FROM A NAPHTHENIC CRUDE WITH A HYDROFINING CATALYST AT A FEED RATE OF 1 TO 3 V./V./HOUR AND AT A PRESSURE OF 500 TO 900 P.S.I.G. IN THE PRESENCE OF FROM 200 TO 900 S.C.F./BBL. OF HYDROGEN FOLLOWED BY TREATING THE HYDROFINED DISTILLATE OILS WITH AN ABSORBENT CLAY.
References Cited (Backward Citations)
GB589150A
Cited
US3000807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |