Patent US4530663A successfully refreshed from Google Patents.
US4530663A
Expired / Lapsed
US
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Denture magnetic retention unit
Assignee: Zest Anchors Inc
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Filing: 1984-07-13
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Granted: 1985-07-23
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Expires: 2004-07-13
Abstract
Abstract A closed field magnetic denture retention unit which includes a ferromagnetic cup containing a cylindrical permanent magnet, the cup and magnet being embedded in the denture; and a magnetic keeper which is embedded in an exposed tooth root in the mouth of a patient and extends across the top of the cup to close the magnetic field when the denture is in place. The unit serves to retain the denture in place by magnetic attraction, the keeper forming a closed magnetic field so that there is not external magnetic field in the mouth of the patient.
Inventors
- 👤 Leonard L. Portnoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:11
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/235
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A denture magnetic retention unit comprising: a first component in the form of a first cup-shaped member of magnetic material having an open top, a permanent magnet positioned within said first cup-shaped member, and a second cupshaped member of non-magnetic material extending into said first cup-shaped member to retain the magnet in said first cup-shaped member; and a second component in the form of a keeper of magnetic material positioned to extend across the open top of said cup-shaped member to close the magnetic field with said open top when the denture is in place.
Claim 2
Dependent Claim
95 words
A denture magnetic retention unit comprising: a first component in the form of a first cup-shaped member of magnetic material having an open top, a permanent magnet positioned within said first cup-shaped member, and a second cupshaped member of non-magnetic material extending into said first cup-shaped member to retain the magnet in said first cup-shaped member; and a second component in the form of a keeper of magnetic material positioned to extend across the open top of said cup-shaped member to close the magnetic field with said open top when the denture is in place.
Claim 3
Dependent Claim
56 words
The denture magnetic retention unit defined in claim 1, in which said magnet is mounted in a pocket formed in the bottom of said first cup-shaped member, and said second cup-shaped member extends between the external surface of the magnet and the internal surface of said first cup-shaped member in press-fit with said first cup-shaped member.
Claim 4
Dependent Claim
44 words
The denture magnetic retention unit defined in claim 1, in which said first component is adapted to be embedded in the denture, and said second component is adapted to be embedded in an exposed root of a tooth in the mouth of a patient.
Claim 5
Dependent Claim
25 words
The denture magnetic retention unit defined in claim 1, in which said first cup-shaped member and said keeper are formed of a ferromagnetic stainless steel.
Claim 6
Dependent Claim
42 words
The denture magnetic retention unit defined in claim 1, in which the permanent magnet has a disc shape with magnetic poles on opposite sides thereof, and with one side of said disc-shaped permanent magnet contacting the bottom of the first cup-shaped member.
Claim 7
Dependent Claim
30 words
The denture magnetic retention unit defined in claim 5, in which the other side of the disc-shaped permanent magnet is displaced inwardly from the top of said first cup-shaped member.
Claim 8
Dependent Claim
18 words
The denture magnetic retention unit defined in claim 1, in which the permanent magnet is a cobalt/samarium alloy.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |