Patent US3227423A successfully refreshed from Google Patents.
US3145301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate circuits utilizing light sources and photoconductors
Assignee: International Business Machines Corp
•
Filing: 1960-12-29
•
Granted: 1964-08-18
•
Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Spruth Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:23
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A GATING CIRCUIT COMPRISING IN COMBINATION: SIGNAL INPUT MEANS, A PLURALITY OF VOLTAGE DIVIDERS CONNECTED IN CASCADE ACROSS SAID SIGNAL INPUT MEANS, EACH OF SAID VOLTAGE DIVIDERS COMPRISING A FIRST PHOTOCONDUCTOR DEVICE AND A SECOND PHOTOCONDUCTOR DEVICE CONNECTED IN SERIES, AN ELECTRICAL LOAD CONNECTED BETWEEN THE FIRST AND SECOND PHOTOCONDUCTOR DEVICES IN THE LAST CASCADE VOLTAGE DIVIDER, A FIRST LIGHT SOURCE POSITIOEND TO ILLUMINATE THE FIRST PHOTOCONDUCTOR DEVICE IN EACH OF SAID VOLTAGE DIVIDERS. A SECOND LIGHT SOURCE NORMALLY ACTIVATED AND POSITIONED TO ILLUMINATE THE SECOND PHOTOCONDUCTOR DEVICE IN EACH OF SAID VOLTAGE DIVIDERS, GATE SIGNAL INPUT MEANS FOR ACTIVATING SAID FIRST LIGHT SOURCE, AND MEANS FOR DEACTIVATING SAID SECOND LIGHT SOURCE WHEN SAID FIRST LIGHT SOURCE IS ACTIVATED.
Claim 2
Dependent Claim
119 words
A GATING CIRCUIT COMPRISING IN COMBINATION: SIGNAL INPUT MEANS, A PLURALITY OF VOLTAGE DIVIDERS CONNECTED IN CASCADE ACROSS SAID SIGNAL INPUT MEANS, EACH OF SAID VOLTAGE DIVIDERS COMPRISING A FIRST PHOTOCONDUCTOR DEVICE AND A SECOND PHOTOCONDUCTOR DEVICE CONNECTED IN SERIES, AN ELECTRICAL LOAD CONNECTED BETWEEN THE FIRST AND SECOND PHOTOCONDUCTOR DEVICES IN THE LAST CASCADE VOLTAGE DIVIDER, A FIRST LIGHT SOURCE POSITIOEND TO ILLUMINATE THE FIRST PHOTOCONDUCTOR DEVICE IN EACH OF SAID VOLTAGE DIVIDERS. A SECOND LIGHT SOURCE NORMALLY ACTIVATED AND POSITIONED TO ILLUMINATE THE SECOND PHOTOCONDUCTOR DEVICE IN EACH OF SAID VOLTAGE DIVIDERS, GATE SIGNAL INPUT MEANS FOR ACTIVATING SAID FIRST LIGHT SOURCE, AND MEANS FOR DEACTIVATING SAID SECOND LIGHT SOURCE WHEN SAID FIRST LIGHT SOURCE IS ACTIVATED.
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) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |