US3969244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of adsorbing heavy metals
Assignee: Ajinomoto Fine Techno Co Inc
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Filing: 1975-05-12
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Granted: 1976-07-13
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Expires: 1995-05-12
Abstract
Abstract Particulate polycondensates of thiourea, thiosemicarbazide, or thiocarbazide with aldehydes and phenolic or amine constituents adsorb heavy metals from aqueous solutions of their compounds, also mercury from its vapors.
Inventors
- 👤 Yoshitaka Kobayashi
- 👤 Kinjiro Sugai, deceased
- 👤 legal successor by Katsuno Suqai
- 👤 legal successor by Hajime Sugai
- 👤 legal successor by Minoru Sugai
- 👤 legal successor by Shunji Sugai
- 👤 legal successor by Hiroshi Sugai
- 👤 Minoru Sugai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:54
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; B; B01; B01J; B01J20/00; B01J20/22; B01J45/00; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C08G14/00; C08G14/02; C08G14/04; C08G14/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A method of removing a heavy metal from an aqueous solution of a salt of said heavy metal which comprises contacting said solution with a particulate resin, said resin essentially consisting of a polycondensation product of a sulfur-bearing constituent, a hydroxy- or aminobenzene, and an aldehyde, said resin being prepared from 1 to 15 moles of said aldehyde and 0.2 to 2.0 moles of said hydroxy- or aminobenzene per mole of said sulfur-bearing constituent, said sulfur-bearing constituent being thiourea, thiosemicarbazide, or thiocarbazide, and hydroxybenzene being phenol, hydroquinone, resorcinol, catechol, pyrogallol, or cresol, said aminobenzene being aniline, m-phenylenediamine, or toluidine, and said aldehyde being formaldehyde, paraldehyde, acetaldehyde, benzaldehyde, or furfural.
Claim 2
Independent Claim
109 words
A method of removing a heavy metal from an aqueous solution of a salt of said heavy metal which comprises contacting said solution with a particulate resin, said resin essentially consisting of a polycondensation product of a sulfur-bearing constituent, a hydroxy- or aminobenzene, and an aldehyde, said resin being prepared from 1 to 15 moles of said aldehyde and 0.2 to 2.0 moles of said hydroxy- or aminobenzene per mole of said sulfur-bearing constituent, said sulfur-bearing constituent being thiourea, thiosemicarbazide, or thiocarbazide, and hydroxybenzene being phenol, hydroquinone, resorcinol, catechol, pyrogallol, or cresol, said aminobenzene being aniline, m-phenylenediamine, or toluidine, and said aldehyde being formaldehyde, paraldehyde, acetaldehyde, benzaldehyde, or furfural.
Claim 3
Dependent Claim
20 words
A method as set forth in claim 1, wherein said hydroxy- or aminobenzene is resorcinol, and said aldehyde is formaldehyde.
Claim 4
Dependent Claim
30 words
A method as set forth in claim 1, wherein said heavy metal is mercury, silver, gold, platinum, palladium, lead, copper, nickel, cobalt, iron, manganese, zinc, cadmium, bismuth, tin, or vanadium.
Claim 5
Dependent Claim
14 words
A method as set forth in claim 1, wherein said sulfur-bearing constituent is thiourea.
Claim 6
Dependent Claim
15 words
A method as set forth in claim 4, wherein said hydroxy- or aminobenzene is resorcinol.
Claim 7
Dependent Claim
29 words
A method as set forth in claim 5, wherein said heavy metal is mercury, silver, gold, platinum, palladium, lead, nickel, cobalt, iron, manganese, zinc, cadmium, bismuth, tin, or vanadium.
Claim 8
Dependent Claim
14 words
A method as set forth in claim 1, wherein said sulfur-bearing constituent is thiocarbazide.
Claim 9
Dependent Claim
15 words
A method as set forth in claim 7, wherein said hydroxy- or aminobenzene is resorcinol.
Claim 10
Dependent Claim
29 words
A method as set forth in claim 8, wherein said heavy metal is mercury, silver, gold, platinum, palladium, lead, nickel, cobalt, iron, manganese, zinc, cadmium, bismuth, tin, or vanadium.
References Cited (Backward Citations)
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Cited
US2412855A
Cited
US2692867A
Cited
US3196107A
Cited
US3313779A
Cited
US3755161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |