US3351820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse stretcher electric circuit
Assignee: Bell and Howell Co
•
Filing: 1964-04-21
•
Granted: 1967-11-07
•
Expires: 1984-04-21
Abstract
No abstract record available.
Inventors
- 👤 Balint Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:25
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/04; H03K21/00; H03K21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
IN COMBINATION WITH DOCUMENT HANDLING APPARATUS HAVING DOCUMENT-ACTUATED SWITCHING MEANS COMPRISING NORMALLY OPEN SWITCH CONTACTS AND ACTUATING MEANS RESPONSIVE TO MOVEMENT OF SHEET-LIKE ARTICLES SUCH AS DOCUMENTS TO DEVELOP SHORT MAKE-BREAK TIME INTERVALS, THE IMPROVEMENT OF: A PULSE STRETCHING CIRCUIT HAVING A SILICON CONTROLLED RECTIFIER WITH A GATE ELECTRODE AND BEING RESPONSIVE TO PULSES OF SHORT TIME DURATION TO ACTUATE AN ELECTROMECHANICAL DEVICE WHICH COULD NOT BE ACTUATED BY SAID PULSES DIRECTLY. AND AN INPUT CITCUIT CONNECTING SAID SWITCHING MEANS TO SAID PULSE STRETCHING CIRCUIT AND MORE SPECIFICALLY COMPRISING: FIRST AND SECOND RESISTORS, ONE OF SAID RESISTORS BEING CONNECTED BETWEEN SAID GATE ELECTRODE OF SAID SILICON CONTROLLED RECTIFIER AND A LINE, ONE OF SAID SWITCH CONTACTS BEING CONDUCTIVE AND BEING CONNECTED TO SAID GATE ELECTRODE, AND A CAPACITOR HAVING ONE TERMINAL CONNECTED TO THE OTHER OF SAID SWITCH CONTACTS AND TO THE OTHER OF SAID RESISTORS AND HAVING THE OTHER TERMINAL THEREOF CONNECTED TO A LINE,
Claim 2
Dependent Claim
156 words
IN COMBINATION WITH DOCUMENT HANDLING APPARATUS HAVING DOCUMENT-ACTUATED SWITCHING MEANS COMPRISING NORMALLY OPEN SWITCH CONTACTS AND ACTUATING MEANS RESPONSIVE TO MOVEMENT OF SHEET-LIKE ARTICLES SUCH AS DOCUMENTS TO DEVELOP SHORT MAKE-BREAK TIME INTERVALS, THE IMPROVEMENT OF: A PULSE STRETCHING CIRCUIT HAVING A SILICON CONTROLLED RECTIFIER WITH A GATE ELECTRODE AND BEING RESPONSIVE TO PULSES OF SHORT TIME DURATION TO ACTUATE AN ELECTROMECHANICAL DEVICE WHICH COULD NOT BE ACTUATED BY SAID PULSES DIRECTLY. AND AN INPUT CITCUIT CONNECTING SAID SWITCHING MEANS TO SAID PULSE STRETCHING CIRCUIT AND MORE SPECIFICALLY COMPRISING: FIRST AND SECOND RESISTORS, ONE OF SAID RESISTORS BEING CONNECTED BETWEEN SAID GATE ELECTRODE OF SAID SILICON CONTROLLED RECTIFIER AND A LINE, ONE OF SAID SWITCH CONTACTS BEING CONDUCTIVE AND BEING CONNECTED TO SAID GATE ELECTRODE, AND A CAPACITOR HAVING ONE TERMINAL CONNECTED TO THE OTHER OF SAID SWITCH CONTACTS AND TO THE OTHER OF SAID RESISTORS AND HAVING THE OTHER TERMINAL THEREOF CONNECTED TO A LINE,
References Cited (Backward Citations)
US3243665A
Cited
US3231786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |