US2868643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming photographic images
Assignee: US Philips Corp
•
Filing: 1956-09-18
•
Granted: 1959-01-13
•
Expires: 1976-09-18
Abstract
No abstract record available.
Inventors
- 👤 Jonge Jelis De
- 👤 Jonker Hendrik
- 👤 Kuening Klaas Jannes
- 👤 Dippel Cornelis Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:43
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/58; G03C1/00; G03C1/72; G03C1/73; Y; Y10; Y10S; Y10S430/00; Y10S430/137
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A METHOD OF PRODUCING PHOTOGRAPHIC CONTRASTS COMPRISING THE STEPS, SELECTIVELY EXPOSING A LIGHT-SENSITIVE LAYER CONTAINING AT LEAST ONE AROMATIC COMPOUND CORRESPONDING TO THE GENERAL FORMULA
Claim 2
Independent Claim
25 words
A METHOD OF PRODUCING PHOTOGRAPHIC CONTRASTS COMPRISING THE STEPS, SELECTIVELY EXPOSING A LIGHT-SENSITIVE LAYER CONTAINING AT LEAST ONE AROMATIC COMPOUND CORRESPONDING TO THE GENERAL FORMULA
References Cited (Backward Citations)
US2733144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |