US3559155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact device
Assignee: Individual
•
Filing: 1968-10-18
•
Granted: 1971-01-26
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Expires: 1988-10-18
Abstract
Abstract THE PRESENT INVENTION CONCERNS A CONTACT DEVICE, AND MORE SPECIFICALLY, RELATES TO AN ELECTRICAL PLUG SOCKET CONNECTION CHARACTERIZED PRIMARILY BY A HELICALLY COILED SPRING THE INSIDE DIMENSIONS OF WHICH IN UNLOADED CONDITION BEING SLIGHTLY SMALLER THAN THE OUTSIDE DIMENSION OF AN INSERTABLE PLUG. THE PENETRATING PLUG WHICH IS PROVIDED WITH A TAPERED END WIDENS THE INTERNAL DIMENSION OF THE SPRING BY SHORTENING ITS AXIAL LENGTH AND MAKES CONTACT WITH THE INTERNAL SURFACE OF THE SPRING EXCEPT AT LEAST THE INNERMOST COIL OF THE SPRING BECAUSE OF ITS TAPERED END.
Inventors
- 👤 Arnold Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:57
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/02; H01R13/33; H01R4/00; H01R4/28; H01R4/48; H01R4/4854; H01R4/4863; H01R13/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |