Patent US2792287A successfully refreshed from Google Patents.
US2792287A
Expired / Lapsed
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Synthetic rutile crystal and method for making same
Assignee: NL Industries Inc
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Filing: 1956-04-04
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Granted: 1957-05-14
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Expires: 1976-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles H Moore
- 👤 Dahlstrom Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:46
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/04; C30B11/08; C30B11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
AS AN ARTICLE OF MANUFACTURE A HIGHLY REFRACTIVE, FLAME-FORMED MONOCRYSTALLINE MASS OF RUTILE ADAPTABLE FOR THE PREPARATION OF GEMS AND OPTICALLY USEFUL OBJECTS HAVING A COLOR, CHARACTERIZED BY A DOMINANT WAVE LENGTH OF ABOUT 480 MILLIMICRONS WITH A LIGHT TRANSMISSION OF ABOUT 25% TO A DOMINANT WAVE LENGTH OF ABOUT 575 MILLIMICRONS WITH A LIGHT TRANSMISSION OF ABOUT 70%, SAID LIGHT TRANSMISSION BEING MEASURED BY A SPECTROPHOTOMETER AT THE DOMINANT WAVE LENGTH THROUGH A SECTION 2.5 MILLIMETERS THICK.
Claim 2
Dependent Claim
78 words
AS AN ARTICLE OF MANUFACTURE A HIGHLY REFRACTIVE, FLAME-FORMED MONOCRYSTALLINE MASS OF RUTILE ADAPTABLE FOR THE PREPARATION OF GEMS AND OPTICALLY USEFUL OBJECTS HAVING A COLOR, CHARACTERIZED BY A DOMINANT WAVE LENGTH OF ABOUT 480 MILLIMICRONS WITH A LIGHT TRANSMISSION OF ABOUT 25% TO A DOMINANT WAVE LENGTH OF ABOUT 575 MILLIMICRONS WITH A LIGHT TRANSMISSION OF ABOUT 70%, SAID LIGHT TRANSMISSION BEING MEASURED BY A SPECTROPHOTOMETER AT THE DOMINANT WAVE LENGTH THROUGH A SECTION 2.5 MILLIMETERS THICK.
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) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |