US2863783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nacreous material from glass
Assignee: FRANCIS EARLE LAB Inc
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Filing: 1956-11-15
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Granted: 1958-12-09
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Expires: 1976-11-15
Abstract
No abstract record available.
Inventors
- 👤 Leon M Greenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:35
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018; C03; C03C; C03C17/00; C03C17/02; Y; Y10; Y10S; Y10S260/00; Y10S260/41
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
A NACREOUS COMPOSITION HAVING, AS A NACREPRODUCING SUBSTANCE THEREIN, GLASS PLATELETS OF A THICKNESS NOT GREATER THAN 2 MICRONS, LENGTH BETWEEN 2 AND 100 MICRONS, AND AVERAGE RATIO OF LENGTH TO THICKNESS OF AT LEAST FOUR, AND AN INDEX OF REFRACTION OF AT LEAST 1.70.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |