US2533233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
beta beta-dicyanoketene dialkyl mercaptoles and method for their preparation
Assignee: Ilford Imaging UK Ltd
•
Filing: 1948-01-15
•
Granted: 1950-12-12
•
Expires: 1968-01-15
Abstract
No abstract record available.
Inventors
- 👤 Edwards Harry Derek
- 👤 Kendall John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:00
CPC Classifications
C; C07; C07C; C07C323/00; C07C323/50; C07C323/51; C07C323/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A BB-DICYANO KETENE DIALKYL MERCAPTOLE.
Claim 2
Dependent Claim
5 words
A BB-DICYANO KETENE DIALKYL MERCAPTOLE.
Claim 3
Dependent Claim
13 words
PROCESS FOR THE PREPARATION OF A B,B-DICYANO KETENE DIALKYL MERCAPTOLE OF THE FORMULA:
Claim 4
Dependent Claim
13 words
PROCESS FOR THE PREPARATION OF A B,B-DICYANO KETENE DIALKYL MERCAPTOLE OF THE FORMULA:
References Cited (Backward Citations)
US2353164A
Cited
US2340882A
Cited
US2342546A
Cited
US2166736A
Cited
US2263749A
Cited
US2322015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |