Patent US2732298A successfully refreshed from Google Patents.
US2732298A
Expired / Lapsed
US
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Method of producing a photograph
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
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Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:17
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; C; C03; C03C; C03C14/00; C03C14/006; C03C21/00; C03C21/008; C03C4/00; C03C4/02; G03C1/705; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE METHOD OF PRODUCING A PERMANENT TWO-DIMENSIONAL PHOTOGRAPHIC IMAGE WITHIN THE SURFACE OF A SILICATE GLASS CONTAINING AN ALKALI METAL OXIDE, WHICH COMPRISES FORMING ON SUCH SURFACE A CHEMICALLY FIXED, PHOTOGRAPHIC IMAGE COMPRISING SILVER, AND HEATING THE GLASS TOGETHER WITH THE IMAGE IN THE PRESENCE OF AIR CONTAINING UP TO 25% BY VOLUME OF SO2 AT A TEMPERATURE BETWEEN ABOUT 125% C. BELOW THE STRAIN POINT OF THE GLASS AND JUST BELOW ITS SOFTENING POINT FOR A TIME SUFFICIENT TO OXIDIZE AND IONIZE THE SILVER AND TO CAUSE MIGRATION OF SILVER IONS INTO THE GLASS.
Claim 2
Independent Claim
95 words
THE METHOD OF PRODUCING A PERMANENT TWO-DIMENSIONAL PHOTOGRAPHIC IMAGE WITHIN THE SURFACE OF A SILICATE GLASS CONTAINING AN ALKALI METAL OXIDE, WHICH COMPRISES FORMING ON SUCH SURFACE A CHEMICALLY FIXED, PHOTOGRAPHIC IMAGE COMPRISING SILVER, AND HEATING THE GLASS TOGETHER WITH THE IMAGE IN THE PRESENCE OF AIR CONTAINING UP TO 25% BY VOLUME OF SO2 AT A TEMPERATURE BETWEEN ABOUT 125% C. BELOW THE STRAIN POINT OF THE GLASS AND JUST BELOW ITS SOFTENING POINT FOR A TIME SUFFICIENT TO OXIDIZE AND IONIZE THE SILVER AND TO CAUSE MIGRATION OF SILVER IONS INTO THE GLASS.
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) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |