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Patent US4155960A successfully refreshed from Google Patents.
US4155960A
Expired / Lapsed
US
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Porcelain tower packing
Assignee: Saint Gobain Abrasives Inc
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Filing: 1977-03-02
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Granted: 1979-05-22
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Expires: 1997-03-02
Abstract
Abstract The inclusion of 15 to 35% by weight of very fine alumina to a clay and flux containing mix for the manufacture of ceramic saddles, for use as tower packing, results in highly acid resistant packing elements.
Inventors
- 👤 William H. Gerdes
- 👤 Walter W. Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:17
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/30; B01J19/02; C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; B01J2219/00; B01J2219/30; B01J2219/302; B01J2219/30203; B01J2219/304; B01J2219/30416; Y; Y10; Y10S; Y10S261/00; Y10S261/72
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
A ceramic saddle shaped packing element which is highly resistant to acid environments made from a ceramic mix containing by weight 28 to 52% clay, 27 to 37% flux selected from the group consisting of feldspar and nepheline syenite, and from 15 to 35% by weight of particulate calcined aluminum oxide, said aluminum oxide having a mass median particle diameter of less than 3 microns and a surface area of from 5 to 10 square meters per gram.
Claim 2
Dependent Claim
78 words
A ceramic saddle shaped packing element which is highly resistant to acid environments made from a ceramic mix containing by weight 28 to 52% clay, 27 to 37% flux selected from the group consisting of feldspar and nepheline syenite, and from 15 to 35% by weight of particulate calcined aluminum oxide, said aluminum oxide having a mass median particle diameter of less than 3 microns and a surface area of from 5 to 10 square meters per gram.
Claim 3
Dependent Claim
34 words
A ceramic saddle packing element as in claim 1 in which the mass median particle diameter is less than 1 micron and the surface area is from 7 to 10 square meters per gram.
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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |