US3222981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-element projection lens
Assignee: Individual
•
Filing: 1961-11-24
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Granted: 1965-12-14
•
Expires: 1981-11-24
Abstract
No abstract record available.
Inventors
- 👤 James W Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:09
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A PROJECTION SYSTEM SUBSTANTIALLY CORRECTED TO SPHERICAL AND CHROMATIC ABERRATION, IN COMBINATION: A CONDENSING MEANS ADAPTED TO CONDENSE THE RAYS FROM A LIGHT SOURCE THROUGH A TRANSPARENT OBJECT, THE COMBINATION OF WIDE-ANGLE PROJECTION LENS ELEMENTS HAVING A MAXIMUM DIAMETER LESS THAN ONE-HALF OBJECT WIDTH, CONSISTING OF A NEGATIVE LENS POSITIONED IN FIXED AXIALLY SPACED RELATION TO SAID CONDENSING MEANS, AND A POSITIVE LENS DISPOSED IN SPACED RELATION TO SAID NEGATIVE LENS ON THE SIDE THEREOF REMOTE FROM SAID CONDENSING MEANS, SAID POSITIVE LENS BEING ADJUSTABLE TO VARYING DISTANCES FROM SAID NEGATIVE LENS FOR FOCUSING, SAID NEGATIVE LENS BEING SO POSITIONED WITH REFERNECE TO SAID CONDENSING MEANS THAT LIGHT RAYS FROM EACH SMALL AREA OF SAID OBJECT WILL PASS THROUGH A CORRESPONDING SMALL AREA OF SAID NAGATIVE LENS, WHICH AREA DOES NOT CHANGE DURING FOCUSING.
Claim 2
Dependent Claim
135 words
IN A PROJECTION SYSTEM SUBSTANTIALLY CORRECTED TO SPHERICAL AND CHROMATIC ABERRATION, IN COMBINATION: A CONDENSING MEANS ADAPTED TO CONDENSE THE RAYS FROM A LIGHT SOURCE THROUGH A TRANSPARENT OBJECT, THE COMBINATION OF WIDE-ANGLE PROJECTION LENS ELEMENTS HAVING A MAXIMUM DIAMETER LESS THAN ONE-HALF OBJECT WIDTH, CONSISTING OF A NEGATIVE LENS POSITIONED IN FIXED AXIALLY SPACED RELATION TO SAID CONDENSING MEANS, AND A POSITIVE LENS DISPOSED IN SPACED RELATION TO SAID NEGATIVE LENS ON THE SIDE THEREOF REMOTE FROM SAID CONDENSING MEANS, SAID POSITIVE LENS BEING ADJUSTABLE TO VARYING DISTANCES FROM SAID NEGATIVE LENS FOR FOCUSING, SAID NEGATIVE LENS BEING SO POSITIONED WITH REFERNECE TO SAID CONDENSING MEANS THAT LIGHT RAYS FROM EACH SMALL AREA OF SAID OBJECT WILL PASS THROUGH A CORRESPONDING SMALL AREA OF SAID NAGATIVE LENS, WHICH AREA DOES NOT CHANGE DURING FOCUSING.
References Cited (Backward Citations)
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US1879737A
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US2800052A
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US2889745A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |