US3578602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochromic compound
Assignee: Fujifilm Holdings Corp
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Filing: 1968-08-29
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Granted: 1971-05-11
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Expires: 1988-08-29
Abstract
Abstract IN WHICH R CAN BE HYDROGEN, A HALOGEN, A CYAN GROUP, A NITRO GROUP, AN ALKYL GROUP (1-8 CARBONS), AN ALKOXY GROUP (1-8 CARBONS) OR AN ALKOXY CARBONYL GROUP (1-8 CARBONS). VARIOUS RESIN AND SOLVENT SYSTEMS WHICH FORM PHOTOCHROMIC COMPOSITIONS WITH THE ABOVE COMPOUND ARE DESCRIBED IN THE SPECIFICATION. THE COMPOUND OR COMPOSITION WILL VARY FROM COLORLESS (NON-EXCITED) TO BLUE (UNDER ULTRAVIOLET), AND EXHIBITS HIGH REVERSIBILITY. A PHOTOCHROMIC COMPOUND REPRESENTED BY THE FORMULA: (2,3-B)-1,4-OXAZINE) SPIRO(1,3-(1,3,3-TRIS(CH3-),5-R-INDOLE)-2,2''(2''H)-NAPHTH-
Inventors
- 👤 Hisatake Ono
- 👤 Tiaki Oasada
- 👤 Kuniko Kosuge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:12
CPC Classifications
C; C07; C07D; C07D498/00; C07D498/02; C07D498/10; G; G03; G03C; G03C1/00; G03C1/685
Claims Analysis
Total Claims: 0
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |