US3664699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic door closure device
Assignee: Individual
•
Filing: 1970-03-12
•
Granted: 1972-05-23
•
Expires: 1990-03-12
Abstract
Abstract THE PRESENT INVENTION RELATES TO A DOOR CLOSURE DEVICE IN WHICH A PERMANENT MAGNET IS ATTACHED TO ONE AND A MAGNETICALLY PERMEABLE MEMBER IS ATTACHED THE RESPECTIVE OTHER ONE OF TWO DOOR MEMBERS MOVABLE RELATIVELY TO EACH OTHER. THE PERMANENT MAGNET IS MOVABLY MOUNTED IN UTS RESPECTIVE MEMBER AND RESILIENTLY URGED IN A DIRECTION OPPOSITE TO THE DIRECTION OF ITS MOVEMENT UNDER THE EFFECT OF THE ATTRACTIVE FORCE BETWEEN THE PERMANENT MAGNET AND THE MAGNETICALLY PERMEABLE MEMBE
Inventors
- 👤 Peter Weigelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:32
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/16; Y; Y10; Y10T; Y10T292/00; Y10T292/11
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |