US2838994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elements for use in practice of spirit duplication process
Assignee: AB Dick Co
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Filing: 1956-04-11
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Granted: 1958-06-17
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Expires: 1976-04-11
Abstract
No abstract record available.
Inventors
- 👤 Richard C Lebl
- 👤 Savit Joseph
- 👤 Robert T Florence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:04
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/025; B41M5/0253
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
AN IMAGED DUPLICATING MASTER COMPRISING A MASTER SHEET AND AN IMAGE ON THE SURFACE OF THE MASTER SHEET CONTAINING A COUPLER CAPABLE OF REACTION WITH A DIAZO COMPOUND TO FORM AN AZO DYESTUFF, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A DIAZO AND AN AMINE CAPABLE OF DIAZOTIZATION, AND A DIAZO-COUPLER COMPLEX COMPOUND SAID MATERIALS BEING SOLUBLE IN A MEDIUM SELECTED FROM THE GROUP CONSISTING OF ALCOHOL AND WATER AND MIXTURES THEREOF, SAID MATERIALS BEING STABILIZE AGAINST COUPLING REACTION TO FORM THE AZO DYESTUFF AT THE PH OF THE IMAGING MATERIALS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |