Patent US3111608A successfully refreshed from Google Patents.
US3111608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact switch device
Assignee: Individual
•
Filing: 1961-02-27
•
Granted: 1963-11-19
•
Expires: 1981-02-27
Abstract
No abstract record available.
Inventors
- 👤 Robert A Boenning
- 👤 Leon S Otis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
A; A01; A01M; A01M23/00; A01M23/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A CONTACT SWITCH APPARATUS RESPONSIVE TO THE PRESENCE OF AN OBJECT TO OPERATE A PAIR OF SPACED CONTACTS, COMPRISING, MEANS TO SUPPLY AN ALTERNATING CURRENT SIGNAL, AMPLIFYING MEANS TO CONVERT SAID ALTERNATING CURRENT SIGNAL TO A SQUARE WAVE OUTPUT SIGNAL, SAID AMPLIFYING MEANS BEING ELECTRICALLY CONNECTED TO SAID MEANS TO SUPPLY AN ALTERNATING CURRENT SIGNAL BY THE PRESENCE OF SAID OBJECT AND SAID SQUARE WAVE OUTPUT SIGNAL BEING REPRESENTATIVE OF THE DURATION OF THE PRESENCE OF SAID OBJECT AS WELL AS BEING INDICATIVE OF ITS PRESENCE PER SE, MEANS FOR CONVERTING SAID SQUARE WAVE OUTPUT SIGNAL TO UNIDIRECTIONAL PULSES, MEANS FOR PROVIDING A SUBSTANTIALLY CONSTANT DURATION CURRENT PULSE FROM SAID UNIDIRECTIONAL PULSES, AND MEANS FOR UTILIZING SAID SUBSTANTIALLY CONSTANT DURATION CURRENT PULSE TO ACTUATE SAID PAIR OF SPACED CONTACTS.
Claim 2
Dependent Claim
129 words
A CONTACT SWITCH APPARATUS RESPONSIVE TO THE PRESENCE OF AN OBJECT TO OPERATE A PAIR OF SPACED CONTACTS, COMPRISING, MEANS TO SUPPLY AN ALTERNATING CURRENT SIGNAL, AMPLIFYING MEANS TO CONVERT SAID ALTERNATING CURRENT SIGNAL TO A SQUARE WAVE OUTPUT SIGNAL, SAID AMPLIFYING MEANS BEING ELECTRICALLY CONNECTED TO SAID MEANS TO SUPPLY AN ALTERNATING CURRENT SIGNAL BY THE PRESENCE OF SAID OBJECT AND SAID SQUARE WAVE OUTPUT SIGNAL BEING REPRESENTATIVE OF THE DURATION OF THE PRESENCE OF SAID OBJECT AS WELL AS BEING INDICATIVE OF ITS PRESENCE PER SE, MEANS FOR CONVERTING SAID SQUARE WAVE OUTPUT SIGNAL TO UNIDIRECTIONAL PULSES, MEANS FOR PROVIDING A SUBSTANTIALLY CONSTANT DURATION CURRENT PULSE FROM SAID UNIDIRECTIONAL PULSES, AND MEANS FOR UTILIZING SAID SUBSTANTIALLY CONSTANT DURATION CURRENT PULSE TO ACTUATE SAID PAIR OF SPACED CONTACTS.
References Cited (Backward Citations)
US2974314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-18 | 1967-05-20 | 1967-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-18 | 1971-05-20 | 1971-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-18 | 1975-05-20 | 1975-11-19 | $7700.00 | Window Closed / Lapsed |