Patent US3285744A successfully refreshed from Google Patents.
US3285744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photography
Assignee: Horizons Inc
•
Filing: 1963-04-04
•
Granted: 1966-11-15
•
Expires: 1983-04-04
Abstract
No abstract record available.
Inventors
- 👤 Robert H Sprague
- 👤 John A Stewart
- 👤 James M Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A COMPOSITION WHICH PRINTS OUT A VISIBLE IMAGE DIRECTLY AS A RESULT OF EXPOSURE TO VISIBLE LIGHT-SAID COMPOSITION CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF (1) AT LEAST ONE LEUCO COMPOUND SELECTED FROM THE GROUP CONSISTING OF LEUCO COMPOUNDS REPRESENTED BY ONE OF THE FOLLOWING GENERAL FORMULAS
Claim 2
Dependent Claim
47 words
A COMPOSITION WHICH PRINTS OUT A VISIBLE IMAGE DIRECTLY AS A RESULT OF EXPOSURE TO VISIBLE LIGHT-SAID COMPOSITION CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF (1) AT LEAST ONE LEUCO COMPOUND SELECTED FROM THE GROUP CONSISTING OF LEUCO COMPOUNDS REPRESENTED BY ONE OF THE FOLLOWING GENERAL FORMULAS
References Cited (Backward Citations)
US1850162A
Cited
US1871830A
Cited
US1918623A
Cited
US2082178A
Cited
US2281895A
Cited
US3055758A
Cited
US3042515A
Cited
US3042516A
Cited
US3104973A
Cited
US3100703A
Cited
US3113024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |