US3564643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for quadrilaterally articulated invisible hinge,adapted to automatically shut a door or a flap and the like
Assignee: Arturo Salice SpA
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Filing: 1969-01-24
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Granted: 1971-02-23
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Expires: 1989-01-24
Abstract
Abstract A DEVICE FOR QUADRILATERALLY ARTICULATED INVISIBLE HINGE, ADAPTED TO AUTOMATICALLY SHUT A DOOR OR FLAP AND THE LIKE WITHOUT THE AID OF ANY OTHER MEMBERS, COMPRISING A SPRING MEMBER SECURED TO THE FIXED ELEMENT OF THE HINGE AND AT LEAST ONE CAM ON WHICH SAID SPRING MEMBER OPERATES, SAID CAM BEING FAST WITH ONE OF THE MOVING ELEMENTS FORMING THE ARTICULATED QUADRILATERAL INCORPORATED IN SAID HINGE, SAID SPRING MEMBER COMPRISING AT LEAST ONE CYLINDRICAL HELICAL SPRING.
Inventors
- 👤 Luciano Salice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:24
CPC Classifications
E; E05; E05D; E05D11/00; E05D11/10; E05D11/1014; E05D11/1021; E05D3/00; E05D3/06; E05D3/14; E05D3/142; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/1246; E05F1/1253; E05Y; E05Y2800/00; E05Y2800/40; E05Y2800/412; E05Y2900/00; E05Y2900/20
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |