US3766080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline materials
Assignee: Kewanee Oil Co
•
Filing: 1971-10-27
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Granted: 1973-10-16
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Expires: 1991-10-27
Abstract
Abstract A COMPOSITION OF MATTER TRANSPARENT TO INFRARED RAYS AND SHOCK RESISTANT WHICH IS A DIRECTIONALLY GROWN, POLYCRYSTALLINE SOLIDIFIED MELT OF A EUTECTIC COMPOSITION COMPRISING AT LEAST TWO COMPONENTS WHEREIN THE RATIO OF THE INDEX OF REFRACTION OF ONE TO THE OTHER IS WITHIN THE RANGE OF 1.2 TO 1.0, THE DIRECTIONALLY ORIENTED, POLYCRYSTALLINE MASS IS GROWN IN A CONTROLLED MANNER BY ADDING HEAT TO THE MELT AND REMOVING THE SAME FROM THE SOLIDS DURING THE SOLIDIFICATION STEP, THE AMOUNT OF HEAT BEING ADDED TO THE MELT AND CONDUCTED THROUGH THE SOLIDIFIED MELT BEING 10**2 TO 10**5 TIMES THE LATENT HEAT OF FUSION OF THE EUTECTIC MIXTURE.
Inventors
- 👤 C Swinehart
- 👤 M Sfiligoj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
C; C30; C30B; C30B21/00; C30B21/02
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |