Patent US2837144A successfully refreshed from Google Patents.
Patent US3345176A successfully refreshed from Google Patents.
US3345176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic products and process
Assignee: Polaroid Corp
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Filing: 1966-10-18
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Granted: 1967-10-03
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Expires: 1986-10-18
Abstract
No abstract record available.
Inventors
- 👤 Herman E Erikson
- 👤 Herbert J Frede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:29
CPC Classifications
G; G03; G03F; G03F5/00; G03C; G03C5/00; G03C5/16; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03F5/02; G03F5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A PROCESS COMPRISING PREPARING A PRESCREENED PHOTOSENSITIVE ELEMENT BY EXPOSING A PHOTOSENSITIVE ELEMENT TO X-RAY RADIATION TO WHICH SAID PHOTOSENSITIVE ELEMENT IS SENSITIVE, SAID EXPOSURE BEING OF A PREDETERMINED INTENSITY AND BEING EFFECTED THROUGH A HALF-TONE SCREENING MEANS COMPRISING MACROSCOPIC CLOSE-PACKED SOLID SPHEROID MEMBERS, SAID SCREENING MEANS BEING SUBSTANTIALLY OPAQUE TO SAID RADIATION IN THE REGIONS OF THE DIAMETERS OF SAID SPHEROID MEMBERS, SUBSTANTIALLY TRASPARENT TO SAID RADIATION IN THE REGIONS OF THE INTERSTICES BETWEEN SAID SPHEROID MEMBERS, AND THE REMAINING AREAS OF SAID SCREENING MEANS BEING CAPABLE OF TRANSMITTING SAID RADIATION IN AMOUNTS WHICH INCREASE AS A FUNCTION OF THE DECREASE IN THICKNESS OF SAID SPHEROID MEMBERS, WHEREBY A LATENT IMAGE IS FORMED ON SAID PHOTOSENSITIVE ELEMENT, SAID LATENT IMAGE WHEN DEVELOPED HAVING A MAXIMUM DENSITY IN AREAS EXPOSED THROUGH SAID INTERSTICES BETWEEN SAID SPHEROID MEMBERS OF SAID SCREENING MEANS, MINIMUM INTENSITY IN AREAS EXPOSED THROUGH SAID DIAMETERS OF SAID SPHEROID MEMBERS OF SAID SCREENING MEANS, AND INTERMEDIATE DENSITY IN AREAS EXPOSED THROUGH THE REMAINING PORTIONS OF SAID SCREENING MEANS, SAID INTERMEDIATE DENSITY INCREASING AS A FUNCTION OF THE DECREASE IN THICKNESS OF THOSE PORTIONS OF SAID SCREENING MEANS THROUGH WHICH IT IS EXPOSED.
Claim 2
Dependent Claim
195 words
A PROCESS COMPRISING PREPARING A PRESCREENED PHOTOSENSITIVE ELEMENT BY EXPOSING A PHOTOSENSITIVE ELEMENT TO X-RAY RADIATION TO WHICH SAID PHOTOSENSITIVE ELEMENT IS SENSITIVE, SAID EXPOSURE BEING OF A PREDETERMINED INTENSITY AND BEING EFFECTED THROUGH A HALF-TONE SCREENING MEANS COMPRISING MACROSCOPIC CLOSE-PACKED SOLID SPHEROID MEMBERS, SAID SCREENING MEANS BEING SUBSTANTIALLY OPAQUE TO SAID RADIATION IN THE REGIONS OF THE DIAMETERS OF SAID SPHEROID MEMBERS, SUBSTANTIALLY TRASPARENT TO SAID RADIATION IN THE REGIONS OF THE INTERSTICES BETWEEN SAID SPHEROID MEMBERS, AND THE REMAINING AREAS OF SAID SCREENING MEANS BEING CAPABLE OF TRANSMITTING SAID RADIATION IN AMOUNTS WHICH INCREASE AS A FUNCTION OF THE DECREASE IN THICKNESS OF SAID SPHEROID MEMBERS, WHEREBY A LATENT IMAGE IS FORMED ON SAID PHOTOSENSITIVE ELEMENT, SAID LATENT IMAGE WHEN DEVELOPED HAVING A MAXIMUM DENSITY IN AREAS EXPOSED THROUGH SAID INTERSTICES BETWEEN SAID SPHEROID MEMBERS OF SAID SCREENING MEANS, MINIMUM INTENSITY IN AREAS EXPOSED THROUGH SAID DIAMETERS OF SAID SPHEROID MEMBERS OF SAID SCREENING MEANS, AND INTERMEDIATE DENSITY IN AREAS EXPOSED THROUGH THE REMAINING PORTIONS OF SAID SCREENING MEANS, SAID INTERMEDIATE DENSITY INCREASING AS A FUNCTION OF THE DECREASE IN THICKNESS OF THOSE PORTIONS OF SAID SCREENING MEANS THROUGH WHICH IT IS EXPOSED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |