US2875106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical whitening agents
Assignee: Hickson and Welch Ltd
•
Filing: 1957-03-15
•
Granted: 1959-02-24
•
Expires: 1977-03-15
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
2026-11-03 11:17
CPC Classifications
C; C07; C07D; C07D417/00; C07D417/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A PROCESS FOR IMPROVING THE WHITENESS AND BRIGHTNESS OF CELLULOSIC TEXTILES COMPRISING TREATING SAID TEXTILES WITH THE COMPOUND HAVING IN ITS FREE ACID FORM THE FORMULA
Claim 2
Dependent Claim
26 words
A PROCESS FOR IMPROVING THE WHITENESS AND BRIGHTNESS OF CELLULOSIC TEXTILES COMPRISING TREATING SAID TEXTILES WITH THE COMPOUND HAVING IN ITS FREE ACID FORM THE FORMULA
References Cited (Backward Citations)
US2694064A
Cited
US2778827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |