US3728329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pearl essences
Assignee: Asahi Kasei Corp
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Filing: 1970-01-15
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Granted: 1973-04-17
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Expires: 1990-01-15
Abstract
Abstract BY CRYSTALLIZING AT LEAST ONE COMPOUND SELECTED FROM NUCLEIC ACIDS AND THEIR RELATIVE NUCLEIC COMPOUNDS FROM AN AQUEOUS SOLUTION THEREOF IN THE PRESENCE OF AT LEAST ONE IONIC SURFACE ACTIVE AGENT N THE SOLUTION, THERE ARE OBTAINED PEARL ESSENCES OF CRYSTALS HAVING SMOOTH SURFACES, UNIFORM SIZE AND SHAPE, A LONG DIAMETER OF 3-100 MICRONS, A SHORT DIAMETER OF 1-40 MICRONS AND A THICKNESS OF 0.03-3 MICRONS, IN A HIGH YIELD. THE PEARL LUSTER OF THE THUS OBTAINED PEARL ESSENCES IS STRONG, AND THESE PEARL ESSENCES ARE RICH IN RESISTANCE TO CHEMICALS, HEAT AND LIGHT. THE IONIC SURFACE ACTIVE AGENTS USED ARE CATIONIC, ANIONIC OR AMPHOTERIC, AND ARE PREFERABLY USED IN A PR
Inventors
- 👤 N Yano
- 👤 M Fukushima
- 👤 M Kishi
- 👤 F Nagayoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018; C09B; C09B67/00; C09B67/0098; C09C2200/00; C09C2200/10; C09C2200/1062; C09C2200/30; C09C2200/301; Y; Y10; Y10S; Y10S424/00; Y10S424/05
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |