US2864752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive compounds
Assignee: Individual
•
Filing: 1957-06-06
•
Granted: 1958-12-16
•
Expires: 1977-06-06
Abstract
No abstract record available.
Inventors
- 👤 Chalkley Lyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732; C; C09; C09B; C09B11/00; C09B11/04; Y; Y10; Y10S; Y10S204/00; Y10S204/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE HYDROPHILIC DYE CYANIDE HAVING THE FORMULA
Claim 2
Dependent Claim
46 words
A PROCESS FOR FORMING A STABLE DYE COMPOUND COMPRISING IRRADIATING WITH ULTRAVIOLET LIGHT IN THE PRESENCE OF WATER, A HYDROPHILIC CYANIDE OF A P-AMINO TRIPHENYLMETHANE DYE CONTAINING A SULFONIC ACID GROUP ORTHO TO THE CENTRAL METHANE CARBON ATOM ON ONE OF THE PHENYL GROUPS ATTACHED THERETO.
References Cited (Backward Citations)
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US2734027A
Cited
GB324966A
Cited
US2150695A
Cited
US2325038A
Cited
US2441561A
Cited
US2469682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |