US2981729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuff and its preparation
Assignee: Wyeth Holdings LLC
•
Filing: 1958-10-27
•
Granted: 1961-04-25
•
Expires: 1978-10-27
Abstract
No abstract record available.
Inventors
- 👤 Kesler Martin Luther
- 👤 Morgan George Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:48
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/025; C09B31/06; C09B31/068; C09B31/072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
IN A PROCESS OF PREPARING AS A DYESTUFF, THE DIPOTASSIUM SALT REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
15 words
IN A PROCESS OF PREPARING AS A DYESTUFF, THE DIPOTASSIUM SALT REPRESENTED BY THE FORMULA
References Cited (Backward Citations)
US314939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |