US2875089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the optical brightening of
Assignee: —
•
Filing: —
•
Granted: 1959-02-24
•
Expires: 1976-02-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3437; C08K5/0008; C08K5/0041; C11; C11D; C11D3/00; C11D3/40; C11D3/42; D; D06; D06L; D06L4/00; D06L4/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF MATERIALS OF POLYESTERS WHICH COMPRISES TREATING THE MATERIAL WITH A NON-QUATERNARY COMPOUND WHICH IS FREE FROM ACID SALTFORMING, WATER SOLUBILIZING GROUPS AND GROUPS IMPARTING DYESTUFF CHARACTER, WHICH IN SOLUTION FLUORESCES GREEN-BLUE TO VIOLET AND WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF MATERIALS OF POLYESTERS WHICH COMPRISES TREATING THE MATERIAL WITH A NON-QUATERNARY COMPOUND WHICH IS FREE FROM ACID SALTFORMING, WATER SOLUBILIZING GROUPS AND GROUPS IMPARTING DYESTUFF CHARACTER, WHICH IN SOLUTION FLUORESCES GREEN-BLUE TO VIOLET AND WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
US2604454A
Cited
US2785133A
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 |