US2592349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing and reducing mononitrated polystyrene
Assignee: Norsk Hydro Elektrisk Kvaelstof AS
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Filing: 1947-07-23
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Granted: 1952-04-08
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Expires: 1967-07-23
Abstract
No abstract record available.
Inventors
- 👤 Skogseid Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:52
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR THE PREPARATION OF A HIGH MOLECULAR WEIGHT POLYMERIC AMINE ION EXCHANGE RESIN COMPRISING NITRATING HIGH MOLECULAR WEIGHT POLYSTYRENE AT A TEMPERATURE BELOW 10* C. WITH NITRIC ACID OF A CONCENTRATION ABOVE 80% BY WEIGHT, TO INTRODUCE THEREBY ONE NITRO GROUP INTO EACH BENZENE RING OF THE HIGH MOLECULAR WEIGHT POLYSTYRENE AND THEREAFTER REDUCING THE MONONITRO HIGH MOLECULAR WEIGHT POLYSTYRENE FORMED BY REACTION WITH AN ALKALI SULPHIDE REDUCING AGENT SELECTED FROM THE CLASS CONSISTING OF SODIUM SULPHIDE AND SODIUM DISULPHIDE, SAID REDUCING AGENT DISSOLVED IN WATER AND SAID REACTION CONDUCTED AT A TEMPERATURE BETWEEN ABOUT 100* C. AND ABOUT 150* C. IN AN AUTOCLAVE.
Claim 2
Dependent Claim
106 words
A PROCESS FOR THE PREPARATION OF A HIGH MOLECULAR WEIGHT POLYMERIC AMINE ION EXCHANGE RESIN COMPRISING NITRATING HIGH MOLECULAR WEIGHT POLYSTYRENE AT A TEMPERATURE BELOW 10* C. WITH NITRIC ACID OF A CONCENTRATION ABOVE 80% BY WEIGHT, TO INTRODUCE THEREBY ONE NITRO GROUP INTO EACH BENZENE RING OF THE HIGH MOLECULAR WEIGHT POLYSTYRENE AND THEREAFTER REDUCING THE MONONITRO HIGH MOLECULAR WEIGHT POLYSTYRENE FORMED BY REACTION WITH AN ALKALI SULPHIDE REDUCING AGENT SELECTED FROM THE CLASS CONSISTING OF SODIUM SULPHIDE AND SODIUM DISULPHIDE, SAID REDUCING AGENT DISSOLVED IN WATER AND SAID REACTION CONDUCTED AT A TEMPERATURE BETWEEN ABOUT 100* C. AND ABOUT 150* C. IN AN AUTOCLAVE.
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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |