US3026210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent alumina and method of preparation
Assignee: General Electric Co
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Filing: 1961-01-03
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Granted: 1962-03-20
•
Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Robert L Coble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:12
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/02; H01J5/04; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/115; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/3222; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5463; C04B2235/60; C04B2235/604; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2235/658; C04B2235/6581; C04B2235/6582; C04B2235/66; C04B2235/661; C04B2235/662; C04B2235/663; C04B2235/70; C04B2235/80; C04B2235/96; C04B2235/9607; C04B2235/9615
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
AS AN ARTICLE OF MANUFACTURE, A HIGH DENSITY, POLYCRYSTALLINE ALUMINA BODY CONSISTING ESSENTIALLY OF HIGH PURITY ALUMINA AND A SMALL BUT EFFECTIVE AMOUNT UP TO 0.5 WEIGHT PERCENT MAGNESIA PERSENT PRIMARILY AS AN ALUMINA-MAGNESIA SPINEL, SAID BODY HAVING AN IN-LINE TRANSMISSION OF NOT LESS THAN 0.5 PERCENT PER MILLIMETER THICKNESS OF SAID BODY OF RADIANT ENERGY OF ALL WAVELENGTHS IN THE WAVELENGTH RANGE FROM ABOUT 0.3 MICRON TO ABOUT 6.6 MICRONS AND HAVING AN IN-LINE TRANSMISSION
Claim 2
Dependent Claim
76 words
AS AN ARTICLE OF MANUFACTURE, A HIGH DENSITY, POLYCRYSTALLINE ALUMINA BODY CONSISTING ESSENTIALLY OF HIGH PURITY ALUMINA AND A SMALL BUT EFFECTIVE AMOUNT UP TO 0.5 WEIGHT PERCENT MAGNESIA PERSENT PRIMARILY AS AN ALUMINA-MAGNESIA SPINEL, SAID BODY HAVING AN IN-LINE TRANSMISSION OF NOT LESS THAN 0.5 PERCENT PER MILLIMETER THICKNESS OF SAID BODY OF RADIANT ENERGY OF ALL WAVELENGTHS IN THE WAVELENGTH RANGE FROM ABOUT 0.3 MICRON TO ABOUT 6.6 MICRONS AND HAVING AN IN-LINE TRANSMISSION
References Cited (Backward Citations)
US2310953A
Cited
US2618567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-19 | 1965-09-18 | 1966-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-19 | 1969-09-18 | 1970-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-19 | 1973-09-18 | 1974-03-20 | $7700.00 | Window Closed / Lapsed |