Patent US3158478A successfully refreshed from Google Patents.
US3158478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of photographic dodging
Assignee: Melpar Inc
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Filing: 1960-08-31
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Granted: 1964-11-24
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Expires: 1980-08-31
Abstract
No abstract record available.
Inventors
- 👤 Richard E Eaton
- 👤 John K Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:50
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/727
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A METHOD OF DODGING IN PHOTOGRAPHY WHEREIN A PRINT IS TO BE PRODUCED ON PRINTING PAPER FROM A NEGATIVE, SAID PAPER BEING OF VARIABLE CONTRAST EMULSION SENSITIVE TO WAVELENGTHS ASSOCIATED WITH ALL COLORS, A SURFACE OF SAID PAPER BEING LOCATED ON A SPHERICAL SURFACE, COMPRISING PLACING THE NEGATIVE ON A SPHERICAL SURFACE CONCENRIC WITH THE SURFACE OF THE PRINTING PAPER BUT SPACED THEREFROM BY APPROXIMATELY 0.05", FORMING AN IMAGE ON THE PAPER BY DIRECTING WHITE LIGHT THROUGH SAID NEGATIVE ONTO SAID PAPER FROM ESSENTIALLY A POINT SOURCE IN A DIRECTION PERPENDICULAR TO SAID SURFACE WHILE SAID PAPER AND NEGATIVE ARE LOCATED ON SAID CONCENTRIC SURFACES, PARTIALLY ERASING SAID IMAGE BY DIRECTING LONG WAVELENGTH DIFFUSE LIGHT THROUGH SAID NEGATIVE ONTO SAID PAPER IN DIRECTIONS MAKING AN ACUTE ANGLE GREATER THAN ZERO WITH RESPECT TO SAID DIRECTION PERPENDICULAR TO SAID SURFACES.
Claim 2
Independent Claim
139 words
A METHOD OF DODGING IN PHOTOGRAPHY WHEREIN A PRINT IS TO BE PRODUCED ON PRINTING PAPER FROM A NEGATIVE, SAID PAPER BEING OF VARIABLE CONTRAST EMULSION SENSITIVE TO WAVELENGTHS ASSOCIATED WITH ALL COLORS, A SURFACE OF SAID PAPER BEING LOCATED ON A SPHERICAL SURFACE, COMPRISING PLACING THE NEGATIVE ON A SPHERICAL SURFACE CONCENRIC WITH THE SURFACE OF THE PRINTING PAPER BUT SPACED THEREFROM BY APPROXIMATELY 0.05", FORMING AN IMAGE ON THE PAPER BY DIRECTING WHITE LIGHT THROUGH SAID NEGATIVE ONTO SAID PAPER FROM ESSENTIALLY A POINT SOURCE IN A DIRECTION PERPENDICULAR TO SAID SURFACE WHILE SAID PAPER AND NEGATIVE ARE LOCATED ON SAID CONCENTRIC SURFACES, PARTIALLY ERASING SAID IMAGE BY DIRECTING LONG WAVELENGTH DIFFUSE LIGHT THROUGH SAID NEGATIVE ONTO SAID PAPER IN DIRECTIONS MAKING AN ACUTE ANGLE GREATER THAN ZERO WITH RESPECT TO SAID DIRECTION PERPENDICULAR TO SAID SURFACES.
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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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |