Patent US3234022A successfully refreshed from Google Patents.
US3234022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion-transfer reversal processes and elements useful in such processes
Assignee: Polaroid Corp
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Filing: 1960-08-08
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Granted: 1966-02-08
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Expires: 1980-08-08
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
- 👤 Meroe M Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:57
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE PROCESS OF FORMING IMAGES BY DIFFUSION-TRANSFER WHICH COMPRISES CONDENSING SILVER PRECIPITATING NUCLEI FROM THE VAPOR PHASE ON A SUPPORT IN A HIGHLY DISPERSED STATE AND ESSENTIALLY FREE OF PROTECTIVE COLLOID TO FORM A PRINT-RECEIVING ELEMENT, DEVELOPING A LATENT IMAGE IN AN EXPOSED SILVER HALIDE LAYER, FORMING A TRANSFERABLE SILVER COMPLEX WITH PART AT LEAST OF THE UNDEVELOPED SILVER HALIDE OF SAID LAYER, TRANSFERRING AT LEAST PART OF SAID COMPLEX TO SAID PRINT-RECEIVING ELEMENT, AND FORMING ON SAID SUPPORT BY MEANS OF THE SILVER TRANSFERRED TO SAID NUCLEI AN IMAGE COMPRISING SILVER.
Claim 2
Dependent Claim
92 words
THE PROCESS OF FORMING IMAGES BY DIFFUSION-TRANSFER WHICH COMPRISES CONDENSING SILVER PRECIPITATING NUCLEI FROM THE VAPOR PHASE ON A SUPPORT IN A HIGHLY DISPERSED STATE AND ESSENTIALLY FREE OF PROTECTIVE COLLOID TO FORM A PRINT-RECEIVING ELEMENT, DEVELOPING A LATENT IMAGE IN AN EXPOSED SILVER HALIDE LAYER, FORMING A TRANSFERABLE SILVER COMPLEX WITH PART AT LEAST OF THE UNDEVELOPED SILVER HALIDE OF SAID LAYER, TRANSFERRING AT LEAST PART OF SAID COMPLEX TO SAID PRINT-RECEIVING ELEMENT, AND FORMING ON SAID SUPPORT BY MEANS OF THE SILVER TRANSFERRED TO SAID NUCLEI AN IMAGE COMPRISING SILVER.
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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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |