US3623993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina desiccant for drying unsaturated organic gaseous compounds
Assignee: CIT Group Business Credit Inc
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Filing: 1970-04-20
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Granted: 1971-11-30
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Expires: 1990-04-20
Abstract
Abstract An active alumina composite characterized by having the capability of drying and simultaneously inhibiting polymerization of organic gaseous polymerization-susceptible compounds is provided. The novel composite comprises a transition alumina substrate having a substantially chi-rho and eta structure and an alkali-modified surface, the composite containing about 3-25 percent by weight of a compound having the empirical formula of MAl(OH)2CO3, where M is K or Na.
Inventors
- 👤 Michael J Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:55
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The composite of claim 1, wherein the said MAl(OH)2CO3 content of the composite is of from about 5up to about 25 percent by weight.
Claim 2
Dependent Claim
21 words
The composite of claim 1, wherein the chi-rho and eta content is at least 50 percent by weight of the substrate.
Claim 3
Dependent Claim
11 words
The composite of claim 1, wherein the MAl(OH)2Co3 compound is KAl(OH)2CO3.
Claim 4
Dependent Claim
12 words
The alumina composite of claim 1 wherein the MAl(OH)2CO3 compound is NaAl(OH)2CO3.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |