US2935481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble fluorescent dye-coated hydrophobic silica and process of making the same
Assignee: Monsanto Chemicals Ltd
•
Filing: 1955-04-20
•
Granted: 1960-05-03
•
Expires: 1975-04-20
Abstract
No abstract record available.
Inventors
- 👤 Carroll A Hochwalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/22; C01; C01B; C01B33/00; C01B33/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF PARTICLES OF HYDROPHOBIC SILICA, WHICH PARTICLES ARE CAPABLE OF FLOATING ON WATER, AND A COATING ON SAID PARTICLES OF A WATER-SOLUBLE FLUORESCENT DYE, SAID COATING COMPRISING FROM 1 TO 25% BY WEIGHT OF SAID SILICA.
Claim 2
Dependent Claim
42 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF PARTICLES OF HYDROPHOBIC SILICA, WHICH PARTICLES ARE CAPABLE OF FLOATING ON WATER, AND A COATING ON SAID PARTICLES OF A WATER-SOLUBLE FLUORESCENT DYE, SAID COATING COMPRISING FROM 1 TO 25% BY WEIGHT OF SAID SILICA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |