US2762802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brightening agents
Assignee: —
•
Filing: —
•
Granted: 1956-09-11
•
Expires: 1973-09-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:58
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
AS AN OPTICAL BRIGHTENING AGENT A STILBENE COMPOUND WHICH IS THE FORM OF THE FREE ACID HAS THE GENERAL FORMULA:
Claim 2
Dependent Claim
20 words
AS AN OPTICAL BRIGHTENING AGENT A STILBENE COMPOUND WHICH IS THE FORM OF THE FREE ACID HAS THE GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |