Powderless etching bath compositions and additives
Abstract
Abstract IMPROVED POWDERLESS ETCHING BATH ADDITIVE COMPOSITIONS, ESPECIALLY FOR ETCHING MAGNESIUM PHOTO-ENGRAVING PLATES, CONTAINING (A) AT LEAST ONE WATER-SOLUBLE OR WATER-DISPPERSIBLE SULFONATED 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 7 TO 24 CARBON ATOMS, (C) AT LEAST ONE POLYHYDRIC ALCOHOL OF FROM 2 TO 10 CARBON ATOMS OR AN ETHER DERIVATIVE THEREOF, AND, OPTIONALLY, (D) AT LEAST ONE LOWER MONO-CARBOXYLIC ACID OF FROM 2 TO 6 CARBON ATOMS AND/OR 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 SIDE WALLS SMOOTHNESS.
Inventors
- 👤 H Messerschmidt
- 👤 K Heyman
- 👤 B Johnsen
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |