Patent US2940847A successfully refreshed from Google Patents.
US2940847A
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Assignee: —
•
Filing: 1957-07-03
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Granted: 1960-06-14
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Expires: 1977-07-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:06
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD FOR PHOTOGRAPHICALLY REPRODUCING IMAGES IN NATURAL COLOR WHICH COMPRISES PROVIDING A UNIFORM LAYER OF DEVELOPER PARTICLES OF AT LEAST TWO PRIMARY COLORS RESTING UPON ONE OF A PAIR OF PARALLEL, SPACED-APART, PLANAR ELECTRODES AT LEAST ONE OF WHICH IS TRANSPARENT TO LIGHT WITHIN THE VISIBLE SPECTRUM, ESTABLISHING AN ELECTROMOTIVE POTENTIAL BETWEEN SAID TWO ELECTRODES, PROJECTING AN IMAGE PATTERN CONTAINING AT LEAST THE SAID TWO OF THE PRIMARY COLORS THROUGH SAID TRANSPARENT ELECTRODE AND TO SAID DEVELOPER PARTICLES THEREBY CAUSING THE DEVELOPER PARTICLES TO SELECTIVELY MIGRATE TO THE OPPOSITE ELECTRODE
Claim 2
Independent Claim
91 words
A METHOD FOR PHOTOGRAPHICALLY REPRODUCING IMAGES IN NATURAL COLOR WHICH COMPRISES PROVIDING A UNIFORM LAYER OF DEVELOPER PARTICLES OF AT LEAST TWO PRIMARY COLORS RESTING UPON ONE OF A PAIR OF PARALLEL, SPACED-APART, PLANAR ELECTRODES AT LEAST ONE OF WHICH IS TRANSPARENT TO LIGHT WITHIN THE VISIBLE SPECTRUM, ESTABLISHING AN ELECTROMOTIVE POTENTIAL BETWEEN SAID TWO ELECTRODES, PROJECTING AN IMAGE PATTERN CONTAINING AT LEAST THE SAID TWO OF THE PRIMARY COLORS THROUGH SAID TRANSPARENT ELECTRODE AND TO SAID DEVELOPER PARTICLES THEREBY CAUSING THE DEVELOPER PARTICLES TO SELECTIVELY MIGRATE TO THE OPPOSITE ELECTRODE
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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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |