US3223778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facsimile system
Assignee: AB Dick Co
•
Filing: 1962-02-26
•
Granted: 1965-12-14
•
Expires: 1982-02-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Stone
- 👤 Roman A Adams
- 👤 Dahl Henry
- 👤 Paul J Estock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:30
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/403; H04N1/32; H04N1/36; H04N1/407; H04N1/4076
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
IN A SYSTEM OF TYPE WHEREIN COPY HAVING DATA THEREIN IS SCANNED BY A PHOTOTUBE FOR GENERATING ELETRICAL SIGNALS THE IMPROVEMENT COMPRISING MEANS TO WHICH SAID ELECTRICAL SIGNALS ARE APPLIED FOR GENERATING THEREFROM A BACKGROUND-LEVEL SIGNAL REPRESENTATIVE OF THE BACKGROUND REFLECTIVITY OF SAID COPY, AND MEANS FOR APPLYING SAID BACKGROUND-LEVEL SIGNAL TO SAID PHOTOTUBE FOR VARYING THE GAIN THEREOF RESPONSIVE TO SAID BACKGROUNDLEVEL SIGNAL FOR ACCENTUATING THE DATA-REPRESENTATIVE PORTION OF SAID ELECTRICAL SIGNALS.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |