US3212401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhomogeneous magnesia-alumina optical lens
Assignee: General Electric Co
•
Filing: 1962-10-03
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Granted: 1965-10-19
•
Expires: 1982-10-03
Abstract
No abstract record available.
Inventors
- 👤 Navias Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:11
CPC Classifications
G; G02; G02B; G02B3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
AS A NEW ARTICLE OF MANUFACTURE, AN INHOMOGENEOUS OPTICAL LENS COMPRISING A TRANSPARENT MAGNESIA-ALUMINA BODY IN WHICH THE RATIO OF ALUMINA TO MAGNESIA VARIES DIRECTLY WITH THE DEPTH WITHIN THE BODY IN A PLANE TRANSVERSE TO THE FOCAL POINT OF THE LENS AND NORMAL TO THE DIRECTION OF RADIATION THROUGH THE LENS.
Claim 2
Dependent Claim
52 words
AS A NEW ARTICLE OF MANUFACTURE, AN INHOMOGENEOUS OPTICAL LENS COMPRISING A TRANSPARENT MAGNESIA-ALUMINA BODY IN WHICH THE RATIO OF ALUMINA TO MAGNESIA VARIES DIRECTLY WITH THE DEPTH WITHIN THE BODY IN A PLANE TRANSVERSE TO THE FOCAL POINT OF THE LENS AND NORMAL TO THE DIRECTION OF RADIATION THROUGH THE LENS.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |