US3822270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrylium dyes having a fused,rigidized nitrogen-containing ring
Assignee: Eastman Kodak Co
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Filing: 1972-04-17
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Granted: 1974-07-02
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Expires: 1992-04-17
Abstract
Abstract A CLASS OF PYRYLIUM DYES, HAVING AT LEAST ONE RIGIDIZED, NITROGEN-CONTAINING HETEROCYCLIC RING FUSED THERETO IS DESCRIBED. THE RIGIDIZED DYES ARE USEFUL LASING COMPONENTS IN LASING MEDIA.
Inventors
- 👤 G Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:24
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/06; C09; C09B; C09B57/00; H; H01; H01S; H01S3/00; H01S3/14; H01S3/20; H01S3/213
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |