US2989411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nacreous iron oxide pigment and method of preparation
Assignee: FRANCIS EARLE LAB Inc
•
Filing: 1957-12-09
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Granted: 1961-06-20
•
Expires: 1977-12-09
Abstract
No abstract record available.
Inventors
- 👤 Suchow Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:26
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018; C01; C01P; C01P2004/00; C01P2004/51; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A SYNTHETIC NACREOUS COMPOSITION HAVING, AS A NACREPRODUCING SUBSTANCE THEREIN, PLATE-LIKE CRYSTALS OF MAGNETIC ALPHA IRON OXIDE, SAID CRYSTALS HAVING A PARTICLE SIZE IN THE RANGE OF ABOUT 2 TO 100 MICRONS IN DIAMETER, A DIAMETER TO THICKNESS RATIO OF AT LEAST 4, SAID CRYSTALS BEING SUSPENDED IN A LIGHT TRANSMITTING LIQUID MEDIUM.
Claim 2
Dependent Claim
53 words
A SYNTHETIC NACREOUS COMPOSITION HAVING, AS A NACREPRODUCING SUBSTANCE THEREIN, PLATE-LIKE CRYSTALS OF MAGNETIC ALPHA IRON OXIDE, SAID CRYSTALS HAVING A PARTICLE SIZE IN THE RANGE OF ABOUT 2 TO 100 MICRONS IN DIAMETER, A DIAMETER TO THICKNESS RATIO OF AT LEAST 4, SAID CRYSTALS BEING SUSPENDED IN A LIGHT TRANSMITTING LIQUID MEDIUM.
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |