US2878138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of brightening material
Assignee: Bayer AG
•
Filing: 1956-09-26
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Granted: 1959-03-17
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Expires: 1976-09-26
Abstract
No abstract record available.
Inventors
- 👤 Raue Roderich
- 👤 Muller Werner
- 👤 Weber Otto
- 👤 Weber Volkmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:31
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/636
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A METHOD OF BRIGHTENING MATERIALS WHICH COMPRISES INCORPORATING INTO THE MATERIALS TO BE BRIGHTENED PRACTICALLY COLOURLESS FLUORESCENT 5.6-BENZOCOUMARIN COMPOUNDS.
Claim 2
Independent Claim
19 words
A METHOD OF BRIGHTENING MATERIALS WHICH COMPRISES INCORPORATING INTO THE MATERIALS TO BE BRIGHTENED PRACTICALLY COLOURLESS FLUORESCENT 5.6-BENZOCOUMARIN COMPOUNDS.
References Cited (Backward Citations)
US2673186A
Cited
US2596107A
Cited
US2776909A
Cited
GB701150A
Cited
US2647132A
Cited
US2702296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |