US2572185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of sulfur dioxide and styrene
Assignee: Celanese Corp
•
Filing: 1947-01-17
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Granted: 1951-10-23
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Expires: 1967-01-17
Abstract
No abstract record available.
Inventors
- 👤 Herman D Noether
- 👤 Irany Ernest Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:08
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
PROCESS FOR THE PRODUCTION OF COPOLYMERS, WHICH COMPRISES COPOLYMERIZING SULFUR DIOXIDE WITH STYRENE IN A REACTION MEDIUM WHERE THE STYRENE AND SULFUR DIOXIDE ARE THE SOLE MATERIALS PERESENT EMPLOYING A COPOLYMERIZATION TEMPERATURE BELOW 85* C.
Claim 2
Dependent Claim
35 words
PROCESS FOR THE PRODUCTION OF COPOLYMERS, WHICH COMPRISES COPOLYMERIZING SULFUR DIOXIDE WITH STYRENE IN A REACTION MEDIUM WHERE THE STYRENE AND SULFUR DIOXIDE ARE THE SOLE MATERIALS PERESENT EMPLOYING A COPOLYMERIZATION TEMPERATURE BELOW 85* C.
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) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |