Patent US569907A successfully refreshed from Google Patents.
Patent US2895892A successfully refreshed from Google Patents.
US2895892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochemical process
Assignee: Individual
•
Filing: 1954-08-10
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Granted: 1959-07-21
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Expires: 1974-08-10
Abstract
No abstract record available.
Inventors
- 👤 Chalkley Lyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:52
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732; G03C1/725
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE PHOTOCHEMICAL PROCESS COMPRISING THE STEPS OF PROVIDING AN INTIMATE MIXTURE OF A HETEROPOLYTUNGSTIC ACID WITH A CARBONACEOUS REDUCING AGENT CHOSEN FROM THE GROUP CONSISTING OF POLYHDRIC ALCOHOL, POLYETHER, POLYAMID, ALDEHYDE, LEUCOBASE OF TRIPHENYLMETHANE DYE, LEUCOBASE OF XANTHENE DYE AND IRRADIATING SAID MIXTURE WITH LIGHT TO PRODUCE A CHEMICAL REACTION BETWEEN THE HETEROPOLYTUNGSTIC ACID AND THE CARBONACEOUS REDUCING AGENT AND THEREBY FORMING A COLORED PRODUCT.
Claim 2
Dependent Claim
65 words
THE PHOTOCHEMICAL PROCESS COMPRISING THE STEPS OF PROVIDING AN INTIMATE MIXTURE OF A HETEROPOLYTUNGSTIC ACID WITH A CARBONACEOUS REDUCING AGENT CHOSEN FROM THE GROUP CONSISTING OF POLYHDRIC ALCOHOL, POLYETHER, POLYAMID, ALDEHYDE, LEUCOBASE OF TRIPHENYLMETHANE DYE, LEUCOBASE OF XANTHENE DYE AND IRRADIATING SAID MIXTURE WITH LIGHT TO PRODUCE A CHEMICAL REACTION BETWEEN THE HETEROPOLYTUNGSTIC ACID AND THE CARBONACEOUS REDUCING AGENT AND THEREBY FORMING A COLORED PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |