US5030611A
Expired / Lapsed
US
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Porous ceramics material
Assignee: Pentax Corp
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Filing: 1988-10-24
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Granted: 1991-07-09
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Expires: 2008-10-24
Abstract
Abstract A porous ceramics material produced by the process comprising the steps of (i) mixing two or more ceramics in such a manner that at least one of the ceramics is different in sinterability from the others and is mixed in an amount of from 1 to 99 wt % based on the total amount of the ceramics; and (ii) sintering thus obtained mixture; a packing for chromatography comprising the porous ceramics material; and a process for producing the porous ceramics material.
Inventors
- 👤 Tetsuro Ogawa
- 👤 Satoshi Fujinuma
- 👤 Katsumi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:42
CPC Classifications
C; C04; C04B; C04B38/00; B; B01; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/048; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/28019; B01J20/28054; B01J20/28078; B01J20/281; B01J20/282; B01J20/30; B01J20/3078; C04B35/00; C04B35/01; C04B35/447
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
66 words
A packing for chromatography comprising a porous ceramic material consisting of hydroxyapatite and tricalcium phosphate which is produced by a process comprising the steps of (i) mixing hydroxyapatite and tricalcium phosphate, wherein said tricalcium phosphate is present in an amount of from 1 to 99 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate; and (ii) sintering the thus obtained mixture.
Claim 2
Dependent Claim
66 words
A packing for chromatography comprising a porous ceramic material consisting of hydroxyapatite and tricalcium phosphate which is produced by a process comprising the steps of (i) mixing hydroxyapatite and tricalcium phosphate, wherein said tricalcium phosphate is present in an amount of from 1 to 99 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate; and (ii) sintering the thus obtained mixture.
Claim 3
Dependent Claim
35 words
A packing for chromatography as claimed in claim 1, wherein the amount of said tricalcium phosphate is from 5 to 95 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate.
Claim 4
Dependent Claim
35 words
A packing for chromatography as claimed in claim 2, wherein the amount of said tricalcium phosphate is from 20 to 80 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate.
Claim 5
Dependent Claim
25 words
A packing for chromatography as claimed in claim 1, wherein said packing for chromatography has an average pore diameter of from 0.005 to 0.1 μm.
Claim 6
Dependent Claim
25 words
A packing for chromatography as claimed in claim 1, wherein said packing for chromatography has an average pore diameter of from 0.1 to 5 μm.
Claim 7
Dependent Claim
20 words
A packing for chromatography as claimed in claim 1, wherein said mixture is sintered at from 700° to 1,400° C.
Claim 8
Dependent Claim
20 words
A packing for chromatography as claimed in claim 1, wherein said packing for chromatography is in a substantially spherical form.
Claim 9
Dependent Claim
21 words
A packing for chromatography as claimed in claim 1, wherein said packing for chromatography has a porosity of 5% or more.
Claim 10
Dependent Claim
59 words
A process for producing a porous ceramic material consisting of hydroxyapatite and tricalcium phosphate comprising the steps of (i) mixing hydroxyapatite and tricalcium phosphate, wherein said tricalcium phosphate is present in an amount of from 1 to 99 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate; and (ii) sintering the thus obtained mixture.
Claim 11
Dependent Claim
59 words
A process for producing a porous ceramic material consisting of hydroxyapatite and tricalcium phosphate comprising the steps of (i) mixing hydroxyapatite and tricalcium phosphate, wherein said tricalcium phosphate is present in an amount of from 1 to 99 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate; and (ii) sintering the thus obtained mixture.
Claim 12
Dependent Claim
71 words
A column for chromatography packed with a porous ceramic material consisting of hydroxyapatite and tricalcium phosphate, wherein said porous ceramics material is produced by a process comprising the steps of (i) mixing hydroxyapatite and tricalcium phosphate, wherein said tricalcium phosphate is present in an amount of from 1 to 99 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate; and (ii) sintering the thus obtained mixture.
Claim 13
Dependent Claim
71 words
A column for chromatography packed with a porous ceramic material consisting of hydroxyapatite and tricalcium phosphate, wherein said porous ceramics material is produced by a process comprising the steps of (i) mixing hydroxyapatite and tricalcium phosphate, wherein said tricalcium phosphate is present in an amount of from 1 to 99 wt. % based on the total amount of said hydroxyapatite and said tricalcium phosphate; and (ii) sintering the thus obtained mixture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |