Patent US4587420A successfully refreshed from Google Patents.
Patent US2501602A successfully refreshed from Google Patents.
US2501602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining highly aromatic petroleum stocks
Assignee: ExxonMobil Oil Corp
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Filing: 1947-09-26
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Granted: 1950-03-21
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Expires: 1967-09-26
Abstract
No abstract record available.
Inventors
- 👤 Howard D Hartough
- 👤 Darwin E Badertscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:08
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/20; C10G29/22; C10G29/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD OF TREATING HIGHLY AROMATIC PETROLEUM STOCK CONSTITUTED PREDOMINANTLY OF POLYCYCLIC AROMATIC HYDROCARBONS TO PROVIDE A LIGHT COLORED STOCK HAVING GREATLY IMPROVED COLOR STABILITY WHICH COMPRISES REACTING A HIGHLY AROMATIC PETROLEUM STOCK OBTAINED AS BOTTOMS IN THE CATALYTIC CRACKING OF PETROLEUM CONTAINING POLYCYCLIC AROMATIC HYDROCARBONS WITH FORMALDEHYDE AND AMMONIUM CHLORIDE, WATER WASHING THE REACTION MIXTURE AND SEPARATING THE WATER WASHED REACTION MIXTURE FROM THE AQUEOUS WASHINGS.
Claim 2
Independent Claim
67 words
A METHOD OF TREATING HIGHLY AROMATIC PETROLEUM STOCK CONSTITUTED PREDOMINANTLY OF POLYCYCLIC AROMATIC HYDROCARBONS TO PROVIDE A LIGHT COLORED STOCK HAVING GREATLY IMPROVED COLOR STABILITY WHICH COMPRISES REACTING A HIGHLY AROMATIC PETROLEUM STOCK OBTAINED AS BOTTOMS IN THE CATALYTIC CRACKING OF PETROLEUM CONTAINING POLYCYCLIC AROMATIC HYDROCARBONS WITH FORMALDEHYDE AND AMMONIUM CHLORIDE, WATER WASHING THE REACTION MIXTURE AND SEPARATING THE WATER WASHED REACTION MIXTURE FROM THE AQUEOUS WASHINGS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |