US3063994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical whitening agents of the stilbene triazole type
Assignee: Hickson and Welch Ltd
•
Filing: 1958-02-25
•
Granted: 1962-11-13
•
Expires: 1978-02-25
Abstract
No abstract record available.
Inventors
- 👤 Adams Dennis Arthur William
- 👤 Sarkar Asim Kumar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:46
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/22; C07D249/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAS
Claim 2
Dependent Claim
12 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAS
References Cited (Backward Citations)
US2713057A
Cited
US2784184A
Cited
US2817665A
Cited
US2765239A
Cited
US2845419A
Cited
US2928830A
Cited
BE561464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-12 | 1966-05-14 | 1966-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-12 | 1970-05-14 | 1970-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-12 | 1974-05-14 | 1974-11-13 | $7700.00 | Window Closed / Lapsed |