US3141156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Danger indicator
Assignee: Individual
•
Filing: 1961-06-14
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Granted: 1964-07-14
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Expires: 1981-06-14
Abstract
No abstract record available.
Inventors
- 👤 Harry J Freedman
- 👤 Harry A Romain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:53
CPC Classifications
B; B66; B66F; B66F11/00; B66F11/04; B66F11/044; B66C; B66C15/00; B66C15/06; B66C15/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A DANGER INDICATOR COMPRISING A METAL FRAME FOR SUPPORTING PERSONNEL, MEANS GROUNDING SAID FRAME THROUGH A HIGH RESISTANCE, A DEACTIVATED SIGNALLING DEVICE ON SAID FRAME, SAID SIGNALLING DEVICE BEING CONNECTED TO A SOURCE OF POWER, AN ELECTRICAL CIRCUIT MEANS CONNECTED TO SAID FRAME AND SAID SIGNALLING DEVICE FOR ACTIVATING SAID SIGNALLING DEVICE IN RESPONSE TO THE PRESENCE OF A VOLTAGE IN SAID FRAME CAPABLE OF HARMING PERSONNEL ON SAID FRAME, SAID ELECTRICAL CIRCUIT MEANS INCLUDING THE PRIMARY OF A TRANSFORMER, SAID ELECTRICAL CIRCUIT MEANS ADDITIONALLY INCLUDING A SECONDARY WINDING IN MUTUAL INDUCTIVE RELATION WITH SAID PRIMARY WINDING, WHEREBY SAID ELECTRICAL CIRCUIT MEANS IS ISOLATED FROM SAID MEANS GROUNDING SAID FRAME.
Claim 2
Dependent Claim
110 words
A DANGER INDICATOR COMPRISING A METAL FRAME FOR SUPPORTING PERSONNEL, MEANS GROUNDING SAID FRAME THROUGH A HIGH RESISTANCE, A DEACTIVATED SIGNALLING DEVICE ON SAID FRAME, SAID SIGNALLING DEVICE BEING CONNECTED TO A SOURCE OF POWER, AN ELECTRICAL CIRCUIT MEANS CONNECTED TO SAID FRAME AND SAID SIGNALLING DEVICE FOR ACTIVATING SAID SIGNALLING DEVICE IN RESPONSE TO THE PRESENCE OF A VOLTAGE IN SAID FRAME CAPABLE OF HARMING PERSONNEL ON SAID FRAME, SAID ELECTRICAL CIRCUIT MEANS INCLUDING THE PRIMARY OF A TRANSFORMER, SAID ELECTRICAL CIRCUIT MEANS ADDITIONALLY INCLUDING A SECONDARY WINDING IN MUTUAL INDUCTIVE RELATION WITH SAID PRIMARY WINDING, WHEREBY SAID ELECTRICAL CIRCUIT MEANS IS ISOLATED FROM SAID MEANS GROUNDING SAID FRAME.
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |