US3336835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color source
Assignee: Welch Scientific Co
•
Filing: 1965-05-05
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Granted: 1967-08-22
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Expires: 1985-05-05
Abstract
No abstract record available.
Inventors
- 👤 Lester R Evensen
- 👤 David A Lieberman
- 👤 Jr Anthony W Vering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:12
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545; G03B27/547
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A COLOR HEAD ADAPTED FOR USE IN CONDENSER TYPE ENLARGERS, SAID COLOR HEAD COMPRISING THREE LIGHT SOURCES DISPOSED AT DIFFERENT ELEVATIONS, MULTI FILM FILTER MEANS TO SEPARATE LIGHT EMITTED FROM EACH OF SAID LIGHT SOURCES INTO LIGHT RAYS HAVIN GWAVE LENGTHS FALLING WITHIN A BAND IDENTIFYING SEPARATE COLOR COMPONENTS, SAID MULTI FILM FILTER MEANS INCLUDING MEANS TO BLEND SAID SEPARATED COLOR COMPONENTS INTO A COAXIAL WHITE LIGHT RAY OF TRANSVERSELY UNIFORM INTENSITY, AND LENS MEANS ADAPTED TO RECEIVE SAID COAXIAL WHITE LIGHT AND FOCUS THE SAME AT A FOCAL POINT COINCIDENTAL WITH THE FOCAL POINT OF A NEGATIVE LENS MEANS FOR UNIFORM TRANSMISSION TO A CONDENSER SYSTEM OF AN ENLARGER.
Claim 2
Dependent Claim
110 words
A COLOR HEAD ADAPTED FOR USE IN CONDENSER TYPE ENLARGERS, SAID COLOR HEAD COMPRISING THREE LIGHT SOURCES DISPOSED AT DIFFERENT ELEVATIONS, MULTI FILM FILTER MEANS TO SEPARATE LIGHT EMITTED FROM EACH OF SAID LIGHT SOURCES INTO LIGHT RAYS HAVIN GWAVE LENGTHS FALLING WITHIN A BAND IDENTIFYING SEPARATE COLOR COMPONENTS, SAID MULTI FILM FILTER MEANS INCLUDING MEANS TO BLEND SAID SEPARATED COLOR COMPONENTS INTO A COAXIAL WHITE LIGHT RAY OF TRANSVERSELY UNIFORM INTENSITY, AND LENS MEANS ADAPTED TO RECEIVE SAID COAXIAL WHITE LIGHT AND FOCUS THE SAME AT A FOCAL POINT COINCIDENTAL WITH THE FOCAL POINT OF A NEGATIVE LENS MEANS FOR UNIFORM TRANSMISSION TO A CONDENSER SYSTEM OF AN ENLARGER.
References Cited (Backward Citations)
US3227040A
Cited
US3222985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |