US3346385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for photo-engraving by use of photo-chromic dye and product
Assignee: Appvion LLC
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Filing: 1964-01-16
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Granted: 1967-10-10
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Expires: 1984-01-16
Abstract
No abstract record available.
Inventors
- 👤 Peter L Foris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:36
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/0045
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
A PROCESS OF ETCHING INCLUDING THE STEPS OF (A) PROVIDING THE MATERIAL TO BE ETCHED WITH A SUBSTANTIALLY AMORPHOUS THIN FILM OF PHOTOCHROMIC MATERIAL OF A SPIROPYRAN CONFIGURATION, THE MOLECULES OF WHICH ARE CONVERTED FROM A NORMAL STATE IN WHICH THEY ARE READILY SOLUBLE IN NON-POLAR HYDROCARBON SOLVENTS TO A STATE WHERE THEY ARE NOT, BY ABSORPTION OF APPLIED LIGHT; (B) FORMING A DESIRED IMAGE IN THE FILM IN TERMS OF SUCH DIFFERENTIAL SOLUBILITY, BY SELECTE APPLICATION THERETO, BY AREAS, OF LIGHT; (C) WASHING AWAY THE UNCONVERTED MOLECULES WITH A NON-POLAR HYDROCARBON SOLVENT TO LEAVE AN IMAGE OF PHOTOCHROMIC MATERIAL WITH A SURROUNDING EXPOSED SUBSTRATE SURFACE TO BE ETCHED; AND (D) ETCHING THE SUBSTRATE MATERIAL BY APPLICATION THERETO OF AN ETCHING MATERIAL TO WHICH THE CONVERTED MOLECULES PROVIDE A BARRIER.
References Cited (Backward Citations)
US3140947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |