US2535276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rhodanic acid and oxarhodanic acid derivatives
Assignee: Ilford Imaging UK Ltd
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Filing: 1948-01-02
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Granted: 1950-12-26
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Expires: 1968-01-02
Abstract
No abstract record available.
Inventors
- 👤 Edwards Harry Derek
- 👤 Kendall John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:31
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/02; C07D277/20; C07D263/00; C07D263/02; C07D263/30; C07D263/34; C07D263/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
PROCESS FOR THE PRODUCTION OF DYESTUFF INTERMEDIATES WHICH COMPRISES REACTING WITH CARBON DISULPHIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AN ALKALI-METAL SALT OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE N-HYDROCARBONSUBSTITUTED DERIVATIVES OF RHODANIC ACID AND OR OXARHODANIC ACID AND REACTING THE RESULTING PRODUCT WITH A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE 1 TO 18 CARBON ATOM AKLYL AND BENZYL SULFATES, CHLORIDES, BROMIDES, IODIDES AND P-TOLUENE SULFONATES.
Claim 2
Dependent Claim
69 words
PROCESS FOR THE PRODUCTION OF DYESTUFF INTERMEDIATES WHICH COMPRISES REACTING WITH CARBON DISULPHIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AN ALKALI-METAL SALT OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE N-HYDROCARBONSUBSTITUTED DERIVATIVES OF RHODANIC ACID AND OR OXARHODANIC ACID AND REACTING THE RESULTING PRODUCT WITH A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE 1 TO 18 CARBON ATOM AKLYL AND BENZYL SULFATES, CHLORIDES, BROMIDES, IODIDES AND P-TOLUENE SULFONATES.
References Cited (Backward Citations)
US2334711A
Cited
US2397013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |