US3589898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Litho plate
Assignee: Polychrome Corp
•
Filing: 1968-10-08
•
Granted: 1971-06-29
•
Expires: 1988-10-08
Abstract
Abstract THIS APPLICATION DESCRIBES A POSITIVE WORKING PRESENSITISED LITHOGRAPHIC PLATE WHICH COMPRISES A SUPPORT BASE HAVING THEREON A LIGHT-SENSITIVE COATING WHICH COMPRISES AN O-NAPHTHIQUINONE 1,2 DIAZIDE OR AN O-BENZOQUINONE 1,2 DIAZIDE AND DISPERSED THROUGHOUT THE COATING A PHOTOCHROMIC COMPOUND WHICH ON EXPOSURE TO STRONG LIGHT CHANGES TO A COLOUR THE ABSORPTION OF WHICH IS ABOVE 500 NM.
Inventors
- 👤 Douglas James Fry
- 👤 Brian Ronald David Whitear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:28
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/0226; G03F7/09; G03F7/105; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References 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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |