US2604456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
For sulfonating
Assignee: —
•
Filing: —
•
Granted: 1952-07-22
•
Expires: 1969-07-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:02
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; C08L; C08L25/00; C08L25/18; C08L25/02; C08L25/04; C08L25/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR THE PRODUCTION OF POLYSTYROL SULPHONIC ACIDS WHICH GIVE A CLEAR SOLUTION IN WATER AS ALKALI METAL SALTS, CONSISTING IN TREATING POLYSTYROL, AT APPROXIMATELY ROOM TEMPERATURE, WITH ADDITION COMPOUNDS OF SULPHURIC ANHYDRIDE ON CYCLIC ETHERS OF THE GROUP CONSISTING OF DIOXANE AND THIOXANE.
Claim 2
Dependent Claim
45 words
A PROCESS FOR THE PRODUCTION OF POLYSTYROL SULPHONIC ACIDS WHICH GIVE A CLEAR SOLUTION IN WATER AS ALKALI METAL SALTS, CONSISTING IN TREATING POLYSTYROL, AT APPROXIMATELY ROOM TEMPERATURE, WITH ADDITION COMPOUNDS OF SULPHURIC ANHYDRIDE ON CYCLIC ETHERS OF THE GROUP CONSISTING OF DIOXANE AND THIOXANE.
References Cited (Backward Citations)
US2533211A
Cited
DE580366C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |