Patent US4277676A successfully refreshed from Google Patents.
US3248218A
Expired / Lapsed
US
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Variable density layers of particles and method of preparing them
Assignee: RCA Corp
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Filing: 1961-06-09
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Granted: 1966-04-26
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Expires: 1981-06-09
Abstract
No abstract record available.
Inventors
- 👤 Paul J Messineo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:29
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/22; H04N9/24; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE METHOD OF LAYING DOWN A VARIABLE DENSITY LAYER OF PARTICLES ONTO A SUPPORT SURFACE COMPRISING THE STEPS OF COATING SAID SURFACE WITH A PHOTOSENSITIVE, PARTICLE ADHESIVE FILM, EXPOSING SAID FILM TO A VARIABLE INTENSITY PATTERN OF LIGHT TO PROVIDE SAID FILM WITH A SURFACE GRADIENT IN ITS PARTICLE ADHESIVE QUALITY WHICH IS INVERSELY RELATED TO SAID PATTERN, WASHING SAID FILM WITH A SOLVENT FOR THE MATERIAL THEREOF, AND THEN WASHING SAID EXPOSED FILMED SURFACE FOR A PERIOD OF TIME IN THE RANGE OF ABOUT 10 SECONDS AND LESS WITH A LIQUID DISPERSION OF PARTICLES, SAID PARTICLES BEING UP TO ABOUT 3 MICRONS IN SIZE, WHEREBY PARTICLES FROM SAID DISPERSION ADHERE TO SAID FILM SURFACE IN A VARIABLE DENSITY PATTERN INVERSELY RELATED TO SAID LIGHT PATTERN.
Claim 2
Independent Claim
126 words
THE METHOD OF LAYING DOWN A VARIABLE DENSITY LAYER OF PARTICLES ONTO A SUPPORT SURFACE COMPRISING THE STEPS OF COATING SAID SURFACE WITH A PHOTOSENSITIVE, PARTICLE ADHESIVE FILM, EXPOSING SAID FILM TO A VARIABLE INTENSITY PATTERN OF LIGHT TO PROVIDE SAID FILM WITH A SURFACE GRADIENT IN ITS PARTICLE ADHESIVE QUALITY WHICH IS INVERSELY RELATED TO SAID PATTERN, WASHING SAID FILM WITH A SOLVENT FOR THE MATERIAL THEREOF, AND THEN WASHING SAID EXPOSED FILMED SURFACE FOR A PERIOD OF TIME IN THE RANGE OF ABOUT 10 SECONDS AND LESS WITH A LIQUID DISPERSION OF PARTICLES, SAID PARTICLES BEING UP TO ABOUT 3 MICRONS IN SIZE, WHEREBY PARTICLES FROM SAID DISPERSION ADHERE TO SAID FILM SURFACE IN A VARIABLE DENSITY PATTERN INVERSELY RELATED TO SAID LIGHT PATTERN.
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |