US2817665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X c chi
Assignee: —
•
Filing: —
•
Granted: 1957-12-24
•
Expires: 1974-12-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:45
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
AS AN OPTICAL BRIGHTENING AGENT A STILBYL DITRIAZOLE COMPOUND CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
13 words
AS AN OPTICAL BRIGHTENING AGENT A STILBYL DITRIAZOLE COMPOUND CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |