US2616894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted thioureas as dyestuff intermediates
Assignee: GAF Chemicals Corp
•
Filing: 1949-12-16
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Granted: 1952-11-04
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Expires: 1969-12-16
Abstract
No abstract record available.
Inventors
- 👤 Henry G Derbyshire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:37
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/60; C07D277/84; C07D277/02; C07D277/20; C07D277/32; C07D277/38; C07D277/44; C07D277/48; C07D277/62; C07D277/68; C07D277/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A SUBSTITUTED THIOUREA DYESTUFF INTERMEDIATE CHARACTERIZED BY THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
10 words
A SUBSTITUTED THIOUREA DYESTUFF INTERMEDIATE CHARACTERIZED BY THE FOLLOWING FORMULA:
References Cited (Backward Citations)
US2536986A
Cited
US2093214A
Cited
US2312040A
Cited
US2394067A
Cited
US2425774A
Cited
US2464785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |