US4883596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonaceous adsorbent for removal of pyrogen and method of producing pure water using same
Assignee: Tokyo Organic Chemical Industries Inc
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Filing: 1988-03-11
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Granted: 1989-11-28
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Expires: 2008-03-11
Abstract
Abstract A carbonaceous absorbent to be used for the removal of a pyrogen dissolved in water is disclosed. The absorbent is obtained by carbonizing porous beads of a cross-linked polymer. This absorbent is favorably used for the removal of endotoxin in the production of pure water from deionized water resulting from the treatment with iron-exchange resins.
Inventors
- 👤 Wataru Agui
- 👤 Shuji Tamura
- 👤 Hiroshi Kuyama
- 👤 Yoshiya Kurachi
- 👤 Masahiko Abe
- 👤 Yukihiro Kaneko
- 👤 Keizo Ogino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:14
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; C02F2103/00; C02F2103/02; C02F2103/04; Y; Y10; Y10S; Y10S210/00; Y10S210/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
A method for the removal of pyrogenic matter dissolved in water, comprising: contacting the water containing pyrogenic matter with a carbonaceous adsorbent prepared by carbonizing porous beads of a cross-linked polymer, wherein the cross-linked porous beads retain their skeletal structure intact through the carbonization treatment.
Claim 2
Independent Claim
45 words
A method for the removal of pyrogenic matter dissolved in water, comprising: contacting the water containing pyrogenic matter with a carbonaceous adsorbent prepared by carbonizing porous beads of a cross-linked polymer, wherein the cross-linked porous beads retain their skeletal structure intact through the carbonization treatment.
Claim 3
Independent Claim
56 words
A method for the removal of endotoxins from water which has been deionized by treatment with an ion exchange resin, which comprises: contacting the deionized water containing endotoxins with a carbonaceous adsorbent prepared by carbonizing porous beads of a cross-linked polymer, wherein the carbonizing treatment allows the skeletal structure of the cross-linked polymer to remain intact.
Claim 4
Independent Claim
56 words
A method for the removal of endotoxins from water which has been deionized by treatment with an ion exchange resin, which comprises: contacting the deionized water containing endotoxins with a carbonaceous adsorbent prepared by carbonizing porous beads of a cross-linked polymer, wherein the carbonizing treatment allows the skeletal structure of the cross-linked polymer to remain intact.
Claim 5
Dependent Claim
20 words
The method as claimed in claim 2 wherein the adsorbent is activated with steam or an aqueous zinc chloride solution.
Claim 6
Dependent Claim
37 words
The method as claimed in claim 2 wherein the adsorbent is obtained by carbonizing porous beads of a cross-linked copolymer of styrene and divinylbenzene or by carbonizing these porous beads and then activating the resulting carbonization product.
Claim 7
Dependent Claim
17 words
The method as claimed in claim 2, wherein the porous beads are infusibilized before they are carbonized.
Claim 8
Dependent Claim
98 words
In a process for producing super pure water or ultra-super pure water by passing water containing a pyrogenic substance through a series of steps of ion-exchange, water storage, sterilization with ultraviolet light, ion exchange with a regeneration type mixed-bed ion exchange resin, filtration with an ultrafiltration membrane or a reverse-osmosis membrane, the improvement comprising: after storage of the water, but prior to filtration, contacting the water containing a pyrogenic substance with a carbonaceous adsorbent prepared by carbonizing porous beads of a cross-linked polymer, wherein the carbonizing treatment allows the skeletal structure of the cross-linked polymer to remain intact.
Claim 9
Dependent Claim
98 words
In a process for producing super pure water or ultra-super pure water by passing water containing a pyrogenic substance through a series of steps of ion-exchange, water storage, sterilization with ultraviolet light, ion exchange with a regeneration type mixed-bed ion exchange resin, filtration with an ultrafiltration membrane or a reverse-osmosis membrane, the improvement comprising: after storage of the water, but prior to filtration, contacting the water containing a pyrogenic substance with a carbonaceous adsorbent prepared by carbonizing porous beads of a cross-linked polymer, wherein the carbonizing treatment allows the skeletal structure of the cross-linked polymer to remain intact.
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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |