Patent US3135779A successfully refreshed from Google Patents.
US3135779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing ortho-aminophenol-beta-hydroxyethylsulfone sulfuric acid esters
Assignee: Hoechst AG
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Filing: 1961-10-03
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Granted: 1964-06-02
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Expires: 1981-10-03
Abstract
No abstract record available.
Inventors
- 👤 Hoyer Ernst
- 👤 Noll Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:55
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/63; C07C309/72; C07C309/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
PROCESS FOR THE PREPARING ORTHO-AMINOPHENOL-B-HYDROXYETHYLSULFONE SULFURIC ACID ESTERS WHICH COMPRISES HEATING B-HYDROXYETHYLSULFONYL-BENZOXAZOLONES OF THE FOLLOWING FORMULA
Claim 2
Dependent Claim
16 words
PROCESS FOR THE PREPARING ORTHO-AMINOPHENOL-B-HYDROXYETHYLSULFONE SULFURIC ACID ESTERS WHICH COMPRISES HEATING B-HYDROXYETHYLSULFONYL-BENZOXAZOLONES OF THE FOLLOWING FORMULA
References Cited (Backward Citations)
DE938145C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |