Patent US4854867A successfully refreshed from Google Patents.
US4854867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental tool for facilitating gingival retraction
Assignee: Newtech Products Inc
•
Filing: 1988-01-28
•
Granted: 1989-08-08
•
Expires: 2008-01-28
Abstract
Abstract A dental tool for facilitating gingival retraction. A shank coupled to a handle terminates in a working end member having a curved edge shaped to generally conform to the curvature of the root surface of a tooth at the gingival level and also to the contour of the marginal gingiva. The exact shape of the curved edge varies with the type of tooth for which the tool is designed. The tool can also be used for shielding the gingiva from a cutting tool working close to the gingiva, and as an aid in installing a rubber dental dam.
Inventors
- 👤 Charles I. Meinershagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:46
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A dental tool for facilitating gingival retraction comprising a shank terminating in a working end member, said working end member having a concave face extending along the body axis of said member and terminating in a curved edge shaped to generally conform to the curvature of the root surface of a tooth at the gingival level and to the contour of the marginal gingival, said concave face being laterally concave with respect to said body axis.
Claim 2
Dependent Claim
76 words
A dental tool for facilitating gingival retraction comprising a shank terminating in a working end member, said working end member having a concave face extending along the body axis of said member and terminating in a curved edge shaped to generally conform to the curvature of the root surface of a tooth at the gingival level and to the contour of the marginal gingival, said concave face being laterally concave with respect to said body axis.
Claim 3
Dependent Claim
14 words
The invention of claim 1 further including a handle portion coupled to said shank.
Claim 4
Dependent Claim
14 words
The invention of claim 2 wherein said shank and said handle portion are unitary.
Claim 5
Dependent Claim
195 words
A dental tool for facilitating gingival retraction comprising: a handle portion having first and second ends; a first shank coupled to said first end and terminating in a first working end member extending at a first angle with respect to said handle portion, said first working end member having a concave face extending along the body axis of said member and terminating in a first curved edge; and a second shank coupled to said second end and terminating in a second working end member extending at a second angle with respect to said handle portion, said second working end member having a concave face extending along the body axis thereof and terminating in a second curved edge; said first and second curved edges being shaped to generally conform to the curvature of the root surface of a tooth at the gingival level and to the contour of the marginal gingiva, each of said concave faces being laterally concave with respect to the body axis of the associated working end member; said first and second angles being arranged so that said first and second working end members extend at generally opposite directions from said handle portion.
Claim 6
Dependent Claim
195 words
A dental tool for facilitating gingival retraction comprising: a handle portion having first and second ends; a first shank coupled to said first end and terminating in a first working end member extending at a first angle with respect to said handle portion, said first working end member having a concave face extending along the body axis of said member and terminating in a first curved edge; and a second shank coupled to said second end and terminating in a second working end member extending at a second angle with respect to said handle portion, said second working end member having a concave face extending along the body axis thereof and terminating in a second curved edge; said first and second curved edges being shaped to generally conform to the curvature of the root surface of a tooth at the gingival level and to the contour of the marginal gingiva, each of said concave faces being laterally concave with respect to the body axis of the associated working end member; said first and second angles being arranged so that said first and second working end members extend at generally opposite directions from said handle portion.
Claim 7
Dependent Claim
26 words
The invention of claim 4 wherein said concave faces are oppositely disposed with respect to a plane passing through the longitudinal axis of said handle portion.
Claim 8
Dependent Claim
19 words
The invention of claim 5 wherein said said first shank, said second shank and said handle portion are unitary.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |