Patent US2862444A successfully refreshed from Google Patents.
US2862444A
Expired / Lapsed
US
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Hectograph process and solvent
Assignee: GAF Chemicals Corp
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Filing: 1956-12-24
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Granted: 1958-12-02
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Drautz Walter Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:19
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/025; B41M5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A HECTOGRAPH PROCESS WHEREIN COPIES ARE PRODUCED BY PRESSING A MASTER SHEET HAVING A DYESTUFF IMAGE THEREON AGAINST A COPY SHEET, AT LEAST ONE OF SAID SHEETS BEING MOISTENED WITH A SOLVENT FOR THE DYESTUFF ON SAID MASTER SHEET WHEREBY A PORTION OF THE DYESTUFF TRANSFERS TO THE COPY SHEET AND THE IMAGE ON SAID MASTER SHEET IS REPRODUCED ON THE COPY SHEET; THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS SAID SOLVENT A HECTOGRAPH SOLVENT COMPOSITION HAVING A LOWER ALKANOL BASE AND CONTAINING BUTYROLACTONE AS AN ESSENTIAL INGREDIENT IN AN AMOUNT EQUAL TO 7 TO 20% OF THE TOTAL WEIGHT OF SAID SOLVENT.
Claim 2
Dependent Claim
103 words
IN A HECTOGRAPH PROCESS WHEREIN COPIES ARE PRODUCED BY PRESSING A MASTER SHEET HAVING A DYESTUFF IMAGE THEREON AGAINST A COPY SHEET, AT LEAST ONE OF SAID SHEETS BEING MOISTENED WITH A SOLVENT FOR THE DYESTUFF ON SAID MASTER SHEET WHEREBY A PORTION OF THE DYESTUFF TRANSFERS TO THE COPY SHEET AND THE IMAGE ON SAID MASTER SHEET IS REPRODUCED ON THE COPY SHEET; THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS SAID SOLVENT A HECTOGRAPH SOLVENT COMPOSITION HAVING A LOWER ALKANOL BASE AND CONTAINING BUTYROLACTONE AS AN ESSENTIAL INGREDIENT IN AN AMOUNT EQUAL TO 7 TO 20% OF THE TOTAL WEIGHT OF SAID SOLVENT.
References Cited (Backward Citations)
US2254469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |