US3625866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolitic desiccant bodies and process for preparing same
Assignee: Union Carbide Corp
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Filing: 1969-07-24
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Granted: 1971-12-07
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Expires: 1989-07-24
Abstract
Abstract Adsorbent bodies suitable for use in drying refrigerants comprise an agglomerate core of zeolitic molecular sieve crystals having thereon over substantially its entire outer surface a hardened permeable coating of a diaspore-clay mineral mixture, said coating being hardened by having impregnated therein cured potassium silicate.
Inventors
- 👤 Robert Mark Conde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:07
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/503
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
Process according to claim 1 wherein the initial agglomerate comprises molecular sieve crystals bonded with clay, said clay comprising from about 5 to about 35 weight percent of the initial agglomerate.
Claim 2
Dependent Claim
74 words
Process according to claim 2 wherein the particles of the diaspore-clay mixture applied to the initial agglomerate have a mesh size of less than 350 mesh, U.S. Standard Sieve, the potassium silicate solution has a potassium oxide-to-silicon dioxide ratio of from about 0.477 to about 0.40, and the quantity of potassium silicate solution employed to impregnate said coated agglomerate is from about 0.03 to about 0.07 pounds of solution solid per pound of agglomerate.
Claim 3
Dependent Claim
20 words
Process according to claim 3 wherein said coating has a thickness of from about 1 micron to about 0.003 inch.
Claim 4
Dependent Claim
21 words
Process according to claim 4 wherein the zeolitic molecular sieve crystals comprise zeolite A and the clay is an attapulgite-type clay.
Claim 5
Dependent Claim
24 words
Process according to claim 5 wherein the zeolite A is the potassium-exchanged form of zeolite A having uniform pore diameters of about 3 Angstroms.
Claim 6
Dependent Claim
13 words
The molecular sieve agglomerate prepared in accordance with the process of claim 1.
Claim 7
Dependent Claim
13 words
The molecular sieve agglomerate prepared in accordance with the process of claim 6.
References Cited (Backward Citations)
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Cited
US3106593A
Cited
US3251783A
Cited
US3234147A
Cited
US3268295A
Cited
US3255027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |