US3104293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hospital call signal switch
Assignee: Individual
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Filing: 1961-03-17
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Granted: 1963-09-17
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Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
- 👤 John E Rendler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:21
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/22; H01H3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
IN A HOSPITAL CALL SYSTEM INCLUDING A WALL JACK IN AN ELECTRICAL CIRCUIT, THE IMPROVED CALL CORD WHICH COMPRISES A FIRST ELECTRICAL CONTACT ELEMENT, A SECOND ELECTRICAL CONTACT ELEMENT DISPOSED COAXIALLY WITHIN SAID FIRST CONTACT ELEMENT AND EXTENDING THEREBEYOND, INSULATION NORMALLY PREVENTING ELECTRICAL CONTACT BETWEEN SAID FIRST AND SECOND CONTACT ELEMENTS, A MAIN HOUSING SECURED TO SAID FIRST CONTACT ELEMENT AND IN ELECTRICAL CONTACT THEREWITH, A CONTACT MEMBER WITHIN SAID HOUSING ELECTRICALLY CONNECTED TO SAID SECOND CONTACT ELEMENT, ADDITIONAL INSULATION NORMALLY PREVENTING ELECTRICAL CONTACT BETWEEN SAID CONTACT MEMBER AND SAID FIRST CONTACT ELEMENT, A MOVABLE PISTON IN SAID HOUSING AND IN ELECTRICAL CONTACT THEREWITH, SAID MOVABLE PISTON BEING NORMALLY SPACED APART FROM SAID CONTACT MEMBER WITHIN SAID HOUSING, AND REMOTE MEANS FOR ACTUATING SAID MOVABLE PISTON, SAID REMOTE MEANS INCLUDING A TUBE CONNECTED TO SAID HOUSING ON THE SIDE OF SAID MOVABLE PISTON AWAY FROM SAID CONTACT MEMBER WITHIN SAID HOUSING, AND A BULB ON SAID TUBE FOR FORCING AIR THROUGH SAID TUBE INTO SAID HOUSING, WHEREBY SAID MOVABLE PISTON IS MOVED INTO ENGAGEMENT WITH SAID CONTACT MEMBER WITHIN SAID HOUSING, THEREBY MAKING ELECTRICAL CONTACT BETWEEN SAID FIRST AND SECOND ELECTRICAL CONTACT ELEMENTS, AND COMPLETING THE CIRCUIT IN SAID WALL JACK.
Claim 2
Dependent Claim
201 words
IN A HOSPITAL CALL SYSTEM INCLUDING A WALL JACK IN AN ELECTRICAL CIRCUIT, THE IMPROVED CALL CORD WHICH COMPRISES A FIRST ELECTRICAL CONTACT ELEMENT, A SECOND ELECTRICAL CONTACT ELEMENT DISPOSED COAXIALLY WITHIN SAID FIRST CONTACT ELEMENT AND EXTENDING THEREBEYOND, INSULATION NORMALLY PREVENTING ELECTRICAL CONTACT BETWEEN SAID FIRST AND SECOND CONTACT ELEMENTS, A MAIN HOUSING SECURED TO SAID FIRST CONTACT ELEMENT AND IN ELECTRICAL CONTACT THEREWITH, A CONTACT MEMBER WITHIN SAID HOUSING ELECTRICALLY CONNECTED TO SAID SECOND CONTACT ELEMENT, ADDITIONAL INSULATION NORMALLY PREVENTING ELECTRICAL CONTACT BETWEEN SAID CONTACT MEMBER AND SAID FIRST CONTACT ELEMENT, A MOVABLE PISTON IN SAID HOUSING AND IN ELECTRICAL CONTACT THEREWITH, SAID MOVABLE PISTON BEING NORMALLY SPACED APART FROM SAID CONTACT MEMBER WITHIN SAID HOUSING, AND REMOTE MEANS FOR ACTUATING SAID MOVABLE PISTON, SAID REMOTE MEANS INCLUDING A TUBE CONNECTED TO SAID HOUSING ON THE SIDE OF SAID MOVABLE PISTON AWAY FROM SAID CONTACT MEMBER WITHIN SAID HOUSING, AND A BULB ON SAID TUBE FOR FORCING AIR THROUGH SAID TUBE INTO SAID HOUSING, WHEREBY SAID MOVABLE PISTON IS MOVED INTO ENGAGEMENT WITH SAID CONTACT MEMBER WITHIN SAID HOUSING, THEREBY MAKING ELECTRICAL CONTACT BETWEEN SAID FIRST AND SECOND ELECTRICAL CONTACT ELEMENTS, AND COMPLETING THE CIRCUIT IN SAID WALL JACK.
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) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |