Patent US2921852A successfully refreshed from Google Patents.
US2921852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive coating and the method for its production
Assignee: Individual
•
Filing: 1958-04-08
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Granted: 1960-01-19
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Expires: 1978-04-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Caton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:56
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A POWDERED SOLID ADAPTED FOR SOLUTION IN A DILUTE AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE TO PRODUCE A COATING COMPOSITION FOR USE IN THE PRODUCTION OF PHOTOLITHOGRAPHIC PRINTING PLATES, EACH PARTICLE OF WHICH COMPRISES A MOLECULAR AS MIXTURE OF AMMONIUM DICHROMATE AND A MILK CASEIN WHICH WAS ORIGNALLY PRODUCED BY PRECIPITATION FROM MILK AND TREATED WITH A STRONG MINERAL ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID AND CHROMIC ACID WHILE UNIFORMLY DISPERSED IN AN AMMONIACAL AQUEOUS SOLUTION AND HAD A MINOR PART PRECIPITATED AND REMOVED FROM THE SAID SOLUTION.
References Cited (Backward Citations)
US2324197A
Cited
US2716061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |