US2935938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of copy reproduction
Assignee: EUGENE LEFEBURE
•
Filing: 1956-04-17
•
Granted: 1960-05-10
•
Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 O'sullivan Denis Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:19
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/025; B41M5/0253
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF PRODUCING COPY BY A HECTOGRAPHIC REPRODUCING PROCESS COMPRISING IMAGING A MASTER SHEET FROM A TRANSFER SHEET HAVING A TRANSFER COATING CONSISTING ESSENTIALLY OF WAX IN ADMIXTURE WITH A SUBSTANTIALLY COLORLESS COMPLEX FORMED BY THE COMBINATION OF (A) THE LEUCO FORM OF A DYE SELECTED FROM THE GROUP CONSISTING OF A TRIPENYLMETHANE DYE AND A DIPHENYLNAPHTHYL METHANE DYE WITH (B) A NON-IONISING SURFACE ACTIVE AGENT CONSISTING OF A HIGHER ALKYLAMINE, AND TRANSFERING SOME OF THE COMPLEX TO A COPY SHEET BROUGHT INTO SUPERIMPOSED CONTACTING RELACTIONSHIP WITH THE MASTER SHEET, THE COLORATION BEING DEVELOPED BY OXIDATION OF THE COMPLEX BY MEANS OF AN OXIDIZING AGENT THEREFOR PRESENT ON THE SURFACE OF SAID COPY SHEET.
Claim 2
Independent Claim
115 words
A METHOD OF PRODUCING COPY BY A HECTOGRAPHIC REPRODUCING PROCESS COMPRISING IMAGING A MASTER SHEET FROM A TRANSFER SHEET HAVING A TRANSFER COATING CONSISTING ESSENTIALLY OF WAX IN ADMIXTURE WITH A SUBSTANTIALLY COLORLESS COMPLEX FORMED BY THE COMBINATION OF (A) THE LEUCO FORM OF A DYE SELECTED FROM THE GROUP CONSISTING OF A TRIPENYLMETHANE DYE AND A DIPHENYLNAPHTHYL METHANE DYE WITH (B) A NON-IONISING SURFACE ACTIVE AGENT CONSISTING OF A HIGHER ALKYLAMINE, AND TRANSFERING SOME OF THE COMPLEX TO A COPY SHEET BROUGHT INTO SUPERIMPOSED CONTACTING RELACTIONSHIP WITH THE MASTER SHEET, THE COLORATION BEING DEVELOPED BY OXIDATION OF THE COMPLEX BY MEANS OF AN OXIDIZING AGENT THEREFOR PRESENT ON THE SURFACE OF SAID COPY SHEET.
References Cited (Backward Citations)
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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) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |