US3140948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photography
Assignee: Horizons Inc
•
Filing: 1961-10-18
•
Granted: 1964-07-14
•
Expires: 1981-10-18
Abstract
No abstract record available.
Inventors
- 👤 John A Stewart
- 👤 Robert H Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/675; G03C1/72; G03C1/73; G03C1/732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PHOTOGRAPHIC PROCESS WHICH COMPRISES: IMAGEWISE EXPOSURE OF A PHOTOSENSITIVE MIXTURE COATED ON A SUITABLE BASE, SAID PHOTOSENSITIVE MIXTURE CONSISTING ESSENTIALLY OF (1) A LEUCO BASE OF A TRIPHENYLMETHANE DYE REPRESENTED BY THE GENERAL FORMULA
Claim 2
Dependent Claim
35 words
A PHOTOGRAPHIC PROCESS WHICH COMPRISES: IMAGEWISE EXPOSURE OF A PHOTOSENSITIVE MIXTURE COATED ON A SUITABLE BASE, SAID PHOTOSENSITIVE MIXTURE CONSISTING ESSENTIALLY OF (1) A LEUCO BASE OF A TRIPHENYLMETHANE DYE REPRESENTED BY THE GENERAL FORMULA
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |