US2928877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing oxyalkyleneamines
Assignee: Wyandotte Chemicals Corp
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Filing: 1957-05-10
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Granted: 1960-03-15
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Jaul Ernest
- 👤 William K Langdon
- 👤 William W Levis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:30
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
A METHOD FOR PREPARING GLYCOL ETHER AMINES, WHICH COMPRISES HEATING AND VAPORIZING A MIXTURE OF A SUBSEQUENTLY DEFINED GLYCOL ETHER, HYDROGEN AND AN AMINATING AGENT SELECTED FROM THE GROUP CONSISTING OF (I) AMMONIA, (2) GLYCOL ETHER AMINES OF THE FORMULA
References Cited (Backward Citations)
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US2412209A
Cited
US2529923A
Cited
US2519560A
Cited
US2754330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |