US2502934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of sulfolanyl ethers
Assignee: Shell Development Co
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Filing: 1946-09-24
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Granted: 1950-04-04
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Expires: 1966-09-24
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Elam
- 👤 Rupert C Morris
- 👤 John L Van Winkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:00
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/46; C07D333/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A COMPOSITION STABLIZED AGAINST DISCOLORATION CONSISTING ESSENTIALLY OF AN ETHER OF THE GROUP CONSISTING OF SULFOLANYL ETHERS, SUBSTITUTED SULFOLANYL ETHERS AND MIXTURES THEREOF, WHICH BECOMES DISCOLORED WHEN EXPOSED TO AIR AND HEAT FOR A SHORT PERIOD OF TIME AND A STABLIZING AMOUNT OF AT LEAST ONE PHENOLIC COMPOUND CONTAINING AN AROMATIC RING AT LEAST ONE RING CARBON ATOM OF WHICH IS JOINED TO A HYDROXYL GROUP, SAID AROMATIC RING OCCURRING NOT MORE THAN TWICE IN THE MOLECULE OF THE SAID PHENOLIC COMPOUND.
Claim 2
Dependent Claim
82 words
A COMPOSITION STABLIZED AGAINST DISCOLORATION CONSISTING ESSENTIALLY OF AN ETHER OF THE GROUP CONSISTING OF SULFOLANYL ETHERS, SUBSTITUTED SULFOLANYL ETHERS AND MIXTURES THEREOF, WHICH BECOMES DISCOLORED WHEN EXPOSED TO AIR AND HEAT FOR A SHORT PERIOD OF TIME AND A STABLIZING AMOUNT OF AT LEAST ONE PHENOLIC COMPOUND CONTAINING AN AROMATIC RING AT LEAST ONE RING CARBON ATOM OF WHICH IS JOINED TO A HYDROXYL GROUP, SAID AROMATIC RING OCCURRING NOT MORE THAN TWICE IN THE MOLECULE OF THE SAID PHENOLIC COMPOUND.
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) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |