US3246986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazo materials for screen process printing
Assignee: Azoplate Corp
•
Filing: 1961-08-07
•
Granted: 1966-04-19
•
Expires: 1981-08-07
Abstract
No abstract record available.
Inventors
- 👤 Henning H Borchers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:30
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/06; C08G12/08; G; G03; G03F; G03F7/00; G03F7/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A PROCESS FOR THE PREPARATION OF A STENCIL FOR SCREEN PROCESS PRINTING COMPRISING APPLYING TO A HIGHLY POROUS CARRIER A MIXTURE OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF A SOLUTION AND A DISPERSION OF AT LEAST ONE ORGANIC COLLOID AND, AS A SENSITIZER, AT LEAST ONE COMPLETELY WATER-SOLUBLE CONDENSATION PRODUCT OF AT LEAST ONE DIAZO DIPHENYLAMINE WITH AT LEAST ONE ALDEHYDE CONDENSED IN THE PRESENCE OF A STRONG ACID, SUBSEQUENTLY REMOVING THE SOLVENT, WHEREBY A MATERIAL IS FORMED IN WHICH SENSITIZED COLLOID COVERS AT LEAST THE PORES OF THE CARRIER, HARDENING THE COLLOID BY EXPOSURE THEREOF TO LIGHT UNDER A PATTERN, AND REMOVING THE COLLOID FROM THOSE PORTIONS OF THE CARRIER NOT STRUCK BY LIGHT TO OPEN THE PORES OF THE MATERIAL IN SUCH PORTIONS.
Claim 2
Dependent Claim
127 words
A PROCESS FOR THE PREPARATION OF A STENCIL FOR SCREEN PROCESS PRINTING COMPRISING APPLYING TO A HIGHLY POROUS CARRIER A MIXTURE OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF A SOLUTION AND A DISPERSION OF AT LEAST ONE ORGANIC COLLOID AND, AS A SENSITIZER, AT LEAST ONE COMPLETELY WATER-SOLUBLE CONDENSATION PRODUCT OF AT LEAST ONE DIAZO DIPHENYLAMINE WITH AT LEAST ONE ALDEHYDE CONDENSED IN THE PRESENCE OF A STRONG ACID, SUBSEQUENTLY REMOVING THE SOLVENT, WHEREBY A MATERIAL IS FORMED IN WHICH SENSITIZED COLLOID COVERS AT LEAST THE PORES OF THE CARRIER, HARDENING THE COLLOID BY EXPOSURE THEREOF TO LIGHT UNDER A PATTERN, AND REMOVING THE COLLOID FROM THOSE PORTIONS OF THE CARRIER NOT STRUCK BY LIGHT TO OPEN THE PORES OF THE MATERIAL IN SUCH PORTIONS.
References Cited (Backward Citations)
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Cited
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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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |