Powderless etching bath compositions
Abstract
Abstract IMPROVED POWDERLESS ETCHING BATH ADDITIVES COMPOSITTIONS, ESPECIALLY FOR ETCHING MAGNESIUM PHOTOENGRAVING PLATES, COMPRISING: (A) AT LEAST ONE WATER-SOLUBLE OR WATER-DISPERSIBLE SULFORNATED FATTY ACID OF FROM 8 TO 24 CARBON ATOMS, WHEREIN THE SULFUR ATOM IN THE SULFONATE GROUP IS DIRECTLY BONDED TO A CARBON ATOM, AND (B) AT LEAST ONE SATURATED OR OLEFINICALLY UNSATURATED MONOCARBOXYLIC ACID OF FROM 8 TO 24 CARBON ATOMS, AND (C) AT LEAST ONE LOWER MONOCARBOXYLIC ACID OF FROM 2 TO 6 CARBON ATOMS AND FOR POLYCARBOXYLIC ACID OF FROM 2 TO 10 CARBON ATOMS, AND ETCHING BATHS CONTAINING SUCH COMPOSITIONS AND NITRIC ACID AND WATER, GIVE GOOD ETCHING PERFORMANCE, PARTICULARLY IMPROVED DEFINITION OF THE PRINTABLE AREA OF THE PLATE, DEPTH OF HALF-TONES, AND SIDEWALL SMOOTHNESS.
Inventors
- 👤 B Johnsen
- 👤 H Messerschmidt
- 👤 K Heyman
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |