US3254997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic processes for making photographic transparencies
Assignee: International Business Machines Corp
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Filing: 1962-01-03
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Granted: 1966-06-07
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Expires: 1982-01-03
Abstract
No abstract record available.
Inventors
- 👤 Schaffert Roland Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:18
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G9/00; G03G9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS OF ELECTROPHOTOGRAPHIC IMAGE REPRODTION, COMPRISING THE STEPS OF BRINGING AN ELECTRIC CHARGE IMAGE BEARING SURFACE ELEMENT OF AN ELECTROPHOTOGRAPHIC DEVICE INTO CONTACT WITH A FILM OF MELTABLE TRANSPARENT DIELECTRIC MATERIAL HAVING ELECTRICALLY CHARGED OPAQUE COLLOIDAL PARTICLES DISPERSED THEREIN, HEATING SAID FILM OF DIELECTRIC MATERIAL TO THE MELTING POINT THEREOF FOR LIQUIDIZING THE SAME, THEREBY RELEASING SAID ELECTRICALLY CHARGED PARTICLES FOR REARRANGEMENT IN ACCORDANCE WITH THE CHARGE IMAGE, COOLING SAID DIELECTRIC MATERIAL TO THE SOLIDIFICATION TEMPERATURE THEREOF FOR REFORMING SAID FILM, AND STRIPPING THE REFORMED FILM FROM SAID ELECTROPHOTOGRAPHIC DEVICE, THEREBY FORMING A PHOTOGRAPHIC TRANSPARENCY.
Claim 2
Dependent Claim
96 words
A PROCESS OF ELECTROPHOTOGRAPHIC IMAGE REPRODTION, COMPRISING THE STEPS OF BRINGING AN ELECTRIC CHARGE IMAGE BEARING SURFACE ELEMENT OF AN ELECTROPHOTOGRAPHIC DEVICE INTO CONTACT WITH A FILM OF MELTABLE TRANSPARENT DIELECTRIC MATERIAL HAVING ELECTRICALLY CHARGED OPAQUE COLLOIDAL PARTICLES DISPERSED THEREIN, HEATING SAID FILM OF DIELECTRIC MATERIAL TO THE MELTING POINT THEREOF FOR LIQUIDIZING THE SAME, THEREBY RELEASING SAID ELECTRICALLY CHARGED PARTICLES FOR REARRANGEMENT IN ACCORDANCE WITH THE CHARGE IMAGE, COOLING SAID DIELECTRIC MATERIAL TO THE SOLIDIFICATION TEMPERATURE THEREOF FOR REFORMING SAID FILM, AND STRIPPING THE REFORMED FILM FROM SAID ELECTROPHOTOGRAPHIC DEVICE, THEREBY FORMING A PHOTOGRAPHIC TRANSPARENCY.
References Cited (Backward Citations)
US2892709A
Cited
US2907674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |