US2950981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nacreous pigment and process of preparing same
Assignee: FRANCIS EARLE LAB Inc
•
Filing: 1957-04-10
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Granted: 1960-08-30
•
Expires: 1977-04-10
Abstract
No abstract record available.
Inventors
- 👤 Harold A Miller
- 👤 Leon M Greenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:42
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
A NACREOUS PIGMENT HAVING, AS A NACRE-PRODUCING SUBSTANCE THEREIN BASIC LEAD CARBONATE IN THE FORM OF HEXAGONAL CRYSTAL PLATELETS OF A DIAMETER OF FROM ABOUT 3 TO 50 MICRONS, A THICKNESS OF FROM ABOUT 10 TO 50 MILLIMICRONS, AND HAVING A LUSTER AT LEAST AS GREAT AS THAT OF NATURAL PEARL ESSENCE AND IN THE RANGE OF ABOUT 650 TO 100 AS DETERMINED BY A STANDARD DIPPING TEST PERFORMED IN A NITROCELLULOSE-CONTAINING DIPPING TEST THE SURFACES THEREOF BEING SMOOTH AND SUBSTANTIALLY FREE OF ADHERING CRYSTAL FRAGMENTS AND UNEVEN OVERGROWTHS.
References Cited (Backward Citations)
GB290844A
Cited
US2097269A
Cited
US2070213A
Cited
US2218940A
Cited
US2363570A
Cited
US2713004A
Cited
US2807858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |