Patent US5037543A successfully refreshed from Google Patents.
US5037543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assemblage of hydroxyl apatite particles and liquid chromatography column using the same
Assignee: Pentax Corp
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Filing: 1990-07-09
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Granted: 1991-08-06
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Expires: 2010-07-09
Abstract
Abstract An assemblage of hydroxyl apatite particles having small and uniform particle size. The median of the particle size is 1 to 10 μm, and at least 90% of the particles in the assemblage have a particle size of not more than 25 μm. The assemblage can be used to pack a liquid chromatography column.
Inventors
- 👤 Tsugio Maejima
- 👤 Kimio Tamai
- 👤 Tetsuo Kanakubo
- 👤 Masao Yoshizawa
- 👤 Nobuaki Tagaya
- 👤 Hideyuki Kuwahara
- 👤 Takao Hashimoto
- 👤 Noriko Komatsu
- 👤 Keiko Fukamachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:26
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/282; B01J20/02; B01J20/04; B01J20/048; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/28019; B01J20/30; B01J20/3085; B01J2220/00; B01J2220/50; B01J2220/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A liquid chromatography column comprising: a hollow tube, a packing contained in said tube, wherein said packing comprises an assemblage of hydroxyl apatite particles of substantially spherical shape, wherein the median of the particle size of said particles is from 1 to 10 μm, and at least 90% of said particles in said assemblage have a particle size of not more than 25 μm, and a first filter mounted on a lower portion of said tube, said first filter having a pore size smaller than said hydroxyl apatite particles of said packing, wherein the packing density of said packing is at least 40%.
Claim 2
Dependent Claim
103 words
A liquid chromatography column comprising: a hollow tube, a packing contained in said tube, wherein said packing comprises an assemblage of hydroxyl apatite particles of substantially spherical shape, wherein the median of the particle size of said particles is from 1 to 10 μm, and at least 90% of said particles in said assemblage have a particle size of not more than 25 μm, and a first filter mounted on a lower portion of said tube, said first filter having a pore size smaller than said hydroxyl apatite particles of said packing, wherein the packing density of said packing is at least 40%.
Claim 3
Dependent Claim
18 words
The liquid chromatography column of claim 1, wherein the packing density of said packing is at least 50%.
Claim 4
Dependent Claim
18 words
The liquid chromatography column of claim 2, wherein the packing density of said packing is at least 55%.
Claim 5
Dependent Claim
18 words
The liquid chromatography column of claim 3, wherein the packing density of said packing is at least 65%.
Claim 6
Dependent Claim
18 words
The liquid chromatography column of claim 4, wherein the packing density of said packing is at least 75%.
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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) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |