US3867462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color inhibitors in glycol ethers
Assignee: Dow Chemical Co
•
Filing: 1972-08-24
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Granted: 1975-02-18
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Expires: 1992-08-24
Abstract
Abstract Alkali and alkaline earth metal borates, even at concentrations of only 10 p.p.m., are effective color inhibitors for glycol ethers, even in the presence of iron.
Inventors
- 👤 Franklin N Keeney
- 👤 Edmund H Sommerfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:49
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/34; C07C41/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A GLYCOL ETHER CONTAINING A COLOR-INHIBITING AMOUNT NOT EXCEEDING ABOUT 100 PPM OF AN ALKALI OR ALKALINE EARTH METAL BORATE WHEREIN THE ETHER HAS THE FORMULA, R(OCNH2N)XOH WHEREIN R IS PHENYL OR ALKYL OF UP TO ABOUT 6 CARBON ATOMS, N IS AN INTEGER 2 TO 4 AND X IS AN INTEGER 1 TO ABOUT 5.
Claim 2
Dependent Claim
56 words
A GLYCOL ETHER CONTAINING A COLOR-INHIBITING AMOUNT NOT EXCEEDING ABOUT 100 PPM OF AN ALKALI OR ALKALINE EARTH METAL BORATE WHEREIN THE ETHER HAS THE FORMULA, R(OCNH2N)XOH WHEREIN R IS PHENYL OR ALKYL OF UP TO ABOUT 6 CARBON ATOMS, N IS AN INTEGER 2 TO 4 AND X IS AN INTEGER 1 TO ABOUT 5.
Claim 3
Dependent Claim
15 words
The ether of claim 1 wherein the borate is sodium or potassium metaborate or tetraborate.
Claim 4
Dependent Claim
24 words
The ether of claim 1 wherein R is alkyl of up to 4 carbon atoms, n iS 2 and x is 1 or 2.
References Cited (Backward Citations)
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US2885446A
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US3262961A
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US3338835A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |