US3781215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for comminuting fluorescent whitening agents and compositions obtained thereby
Assignee: Bayer Corp
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Filing: 1971-11-22
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Granted: 1973-12-25
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Expires: 1991-11-22
Abstract
Abstract A PROCESS FOR COMMINUTING RELATIVELY LARGE CRYSTALS OF SOLID FLUORESCENT WHITENING AGENTS TO A PARTICLE SIZE HAVING A DIAMETER NO GREATER THAN 5 MICRONS WHICH COMPRISES GRINDING A WATER-WET PRESSCAKE OF SAID AGENT WITH AT LEAST ONE MOLECULAR EQUIVALENT OF ANHYDROUS SODIUM SULFATE FOR EACH TEN MOLECULAR EQUIVALENTS OF WATER PRESENT IN THE PRESSCAKE AND THE FLUORESCENT WHITENING COMPOSITIONS OBTAINED THEREBY.
Inventors
- 👤 T Langstroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:28
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/40; C11D3/42; D; D06; D06L; D06L4/00; D06L4/60; D06L4/664
Claims Analysis
Total Claims: 0
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |