Patent US4334307A successfully refreshed from Google Patents.
US3181007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic contrast circuit employing two cascaded difference amplifiers for changing slope of information signal
Assignee: Unisys Corp
•
Filing: 1962-09-07
•
Granted: 1965-04-27
•
Expires: 1982-09-07
Abstract
No abstract record available.
Inventors
- 👤 Virgil A Hinds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:12
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40087; G; G06; G06V; G06V30/00; G06V30/10; G06V30/16; G06V30/162; H03; H03K; H03K5/00; H03K5/003; H03K5/01; H03K5/12; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A CIRCUIT FOR IMPROVING THE WAVEFORM OF A PULSE TRAIN COMPRISING A FIRST DIFFERENCE AMPLIFIER FOR RECEIVING THE ORIGINAL WAVEFORM, AND THE ORIGINAL WAVEFORM DELAYED IN TIME, FOR DECREASING THE RISE TIME OF THE WAVEFORM AND A SECOND DIFFERENCE AMPLIFIER COUPLED TO RECEIVE THE OUTPUT WAVEFORM FROM THE FIRST DIFFERENCE AMPLIFIER AND THE WAVEFORM FROM THE FIRST DIFFERENCE AMPLIFIER
Claim 2
Dependent Claim
59 words
A CIRCUIT FOR IMPROVING THE WAVEFORM OF A PULSE TRAIN COMPRISING A FIRST DIFFERENCE AMPLIFIER FOR RECEIVING THE ORIGINAL WAVEFORM, AND THE ORIGINAL WAVEFORM DELAYED IN TIME, FOR DECREASING THE RISE TIME OF THE WAVEFORM AND A SECOND DIFFERENCE AMPLIFIER COUPLED TO RECEIVE THE OUTPUT WAVEFORM FROM THE FIRST DIFFERENCE AMPLIFIER AND THE WAVEFORM FROM THE FIRST DIFFERENCE AMPLIFIER
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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |