US3428684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alkanol amines
Assignee: Commercial Solvents Corp
•
Filing: 1966-11-02
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Granted: 1969-02-18
•
Expires: 1986-11-02
Abstract
No abstract record available.
Inventors
- 👤 John B Tindall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/286; B; B01; B01J; B01J20/00; B01J20/22; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A PROCESS FOR THE PURIFICATION OF A MALODOROUS ALKANOLAMINE CONTAINING COLOR-PRODUCING IMPURITIES, SAID ALKANOLAMINES CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
18 words
A PROCESS FOR THE PURIFICATION OF A MALODOROUS ALKANOLAMINE CONTAINING COLOR-PRODUCING IMPURITIES, SAID ALKANOLAMINES CORRESPONDING TO THE FORMULA:
References Cited (Backward Citations)
US3151166A
Cited
US3207790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |