US3847841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thiosemicarbazido heavy metal adsorbing resins
Assignee: Tokuyama Corp
•
Filing: 1973-03-07
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Granted: 1974-11-12
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Expires: 1993-03-07
Abstract
Abstract 1. A HEAVY METAL ABSORBING RESIN CONSISTING ESSENTIALLY OF A POLYMER CONPRISING: A. A BACKBONE POLYMER SELECTED FROM AT LEAST ONE OF POLYSTYRENE, POLYVINYL CHLORIDE, A COPOLYMER OF VINYL CHLORIDE WITH ANOTHER COPOLYMERIZABLE MONOMER, A GRAFT COPOLYMER OF A RUBBERY SUBSTANCE TO WHICH VINYL CHLORIDE HAS BEEN GRAFTED, AND A CHLORINATED POLYOLEFIN; AND B. A MOIETY ATTACHED TO THE BACKBONE POLYMER WHICH IS SELECTED FROM AT LEAST ONE THIOSEMICARBAZIDE OF THE GROUP CONSISTING OF -NHNHCSNHR AND -NHCSNHNHR, WHEREIN R IS A HYDROGEN ATOM, ALKYL MOIETY, ARYL MOIETY, OR ACYL MOIETY.
Inventors
- 👤 N Kuramoto
- 👤 K Motani
- 👤 A Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:56
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/22; B; B01; B01J; B01J20/00; B01J20/22; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C08F; C08F8/00; C08F8/30; C08F8/32; C08F8/34; C08F8/42; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; C08F2810/00; C08F2810/30; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S210/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A HEAVY METAL ABSORBING RESIN CONSISTING ESSENTIALLY OF A POLYMER CONPRISING: A. A BACKBONE POLYMER SELECTED FROM AT LEAST ONE OF POLYSTYRENE, POLYVINYL CHLORIDE, A COPOLYMER OF VINYL CHLORIDE WITH ANOTHER COPOLYMERIZABLE MONOMER, A GRAFT COPOLYMER OF A RUBBERY SUBSTANCE TO WHICH VINYL CHLORIDE HAS BEEN GRAFTED, AND A CHLORINATED POLYOLEFIN; AND B. A MOIETY ATTACHED TO THE BACKBONE POLYMER WHICH IS SELECTED FROM AT LEAST ONE THIOSEMICARBAZIDE OF THE GROUP CONSISTING OF -NHNHCSNHR AND -NHCSNHNHR, WHEREIN R IS A HYDROGEN ATOM, ALKYL MOIETY, ARYL MOIETY, OR ACYL MOIETY.
Claim 2
Dependent Claim
89 words
A HEAVY METAL ABSORBING RESIN CONSISTING ESSENTIALLY OF A POLYMER CONPRISING: A. A BACKBONE POLYMER SELECTED FROM AT LEAST ONE OF POLYSTYRENE, POLYVINYL CHLORIDE, A COPOLYMER OF VINYL CHLORIDE WITH ANOTHER COPOLYMERIZABLE MONOMER, A GRAFT COPOLYMER OF A RUBBERY SUBSTANCE TO WHICH VINYL CHLORIDE HAS BEEN GRAFTED, AND A CHLORINATED POLYOLEFIN; AND B. A MOIETY ATTACHED TO THE BACKBONE POLYMER WHICH IS SELECTED FROM AT LEAST ONE THIOSEMICARBAZIDE OF THE GROUP CONSISTING OF -NHNHCSNHR AND -NHCSNHNHR, WHEREIN R IS A HYDROGEN ATOM, ALKYL MOIETY, ARYL MOIETY, OR ACYL MOIETY.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |