US2493071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur-containing carboxylic acid esters
Assignee: Ilford Imaging UK Ltd
•
Filing: 1946-08-02
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Granted: 1950-01-03
•
Expires: 1966-08-02
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
- 👤 Edwards Harry Derek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:03
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/14; C07D; C07D339/00; C07D339/02; C07D339/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
PROCESS FOR THE PRODUCTION OF ORGANIC COMPOUNDS WHICH COMPRISES REACTING CARBON DISULFIED WITH A DRY ALKALI-METAL DERIVATIVE OF A REACTIVE METHYLENE COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
26 words
PROCESS FOR THE PRODUCTION OF ORGANIC COMPOUNDS WHICH COMPRISES REACTING CARBON DISULFIED WITH A DRY ALKALI-METAL DERIVATIVE OF A REACTIVE METHYLENE COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2193415A
Cited
GB549202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |