Patent US4370503A successfully refreshed from Google Patents.
US4370503A
Expired / Lapsed
US
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Catalyst for methylamines production
Assignee: EIDP Inc
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Filing: 1981-03-24
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Granted: 1983-01-25
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Expires: 2001-03-24
Abstract
Abstract In the catalytic preparation of methylamines from methanol or dimethyl ether and ammonia using a silica-alumina catalyst, catalyst coking and byproduct formation are reduced and reaction speed and catalyst thermal stability are enhanced when a catalyst containing a high level of alumina is used.
Inventors
- 👤 Loren D. Brake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:33
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
In the catalytic preparation of methylamines from methanol or dimethyl ether and ammonia using a silica-alumina catalyst, the improvement which comprises using a catalyst which contains, by weight, 1-13% of silica and 87-99% of alumina.
Claim 2
Dependent Claim
35 words
In the catalytic preparation of methylamines from methanol or dimethyl ether and ammonia using a silica-alumina catalyst, the improvement which comprises using a catalyst which contains, by weight, 1-13% of silica and 87-99% of alumina.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which the catalyst used contains, by weight, 3-10% of silica and 90-97% of alumina.
Claim 4
Dependent Claim
22 words
The process of claim 1 in which the catalyst used contains, by weight, about 6% of silica and about 94% of alumina.
References Cited (Backward Citations)
US3384667A
Cited
US4082805A
Cited
DD134518A1
Cited
GB2013660A
Cited
US4191709A
Cited
US4205012A
Cited
US4254061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |