Patent US4850868A successfully refreshed from Google Patents.
US4850868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray shield
Assignee: Dentsply Research and Development Corp
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Filing: 1987-07-13
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Granted: 1989-07-25
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Expires: 2007-07-13
Abstract
Abstract The apparatus comprises a tubular member that is adapted to be attached to the working end of a dental handpiece and is used to contain and direct material dispensed from the handpiece in order to reduce the amount of airborne particles emitted into the atmosphere by the handpiece and to accurately direct the dispensed material to the desired area. The apparatus is adapted to provide a reference point for the practitioner in establishing the optimum working distance of the handpiece from a particular working area in the mouth when the handpiece is used. An improved dental handpiece using the apparatus of the invention and a method of using the apparatus are also provided.
Inventors
- 👤 Gerard Wright
- 👤 George E. Warrin
- 👤 Richard H. Paschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:18
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/02; A61C3/025; A61C17/00; A61C17/02; A61C17/0202
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
In a dental handpiece having means for applying a liquid or a liquid and abrasive powder to a working area of the mouth in which said liquid or liquid and abrasive powder is applied under pressure to said working area, wherein the improvement comprises a tubular member having a first end attached to the working end of said handpiece, and a second end adapted to extend a distance beyond the working end of said handpiece, wherein said tubular member is adapted to direct and restrain material dispensed from said handpiece and to maintain a substantially optimum working distance between said working end of said handpiece and a working area on which said dental handpiece is used.
Claim 2
Dependent Claim
116 words
In a dental handpiece having means for applying a liquid or a liquid and abrasive powder to a working area of the mouth in which said liquid or liquid and abrasive powder is applied under pressure to said working area, wherein the improvement comprises a tubular member having a first end attached to the working end of said handpiece, and a second end adapted to extend a distance beyond the working end of said handpiece, wherein said tubular member is adapted to direct and restrain material dispensed from said handpiece and to maintain a substantially optimum working distance between said working end of said handpiece and a working area on which said dental handpiece is used.
Claim 3
Dependent Claim
40 words
The dental handpiece according to claim 1 in which said tubular member is elastomeric to a degree sufficient to stretch and fit over the working end of said handpiece and to be held tightly on the end of said handpiece.
Claim 4
Dependent Claim
100 words
The dental handpiece according to claim 1 in which said first end is part of a first portion which is adapted to fit on the end of said handpiece and said second end is part of a second portion which extends from the end of said handpiece to said second end, and the length of said second portion is adjustable so that the distance from the working end of the handpiece to the working area provides an optimum and constant working distance for a particular working area when said second end is held in close proximity to the working area.
Claim 5
Dependent Claim
15 words
The dental handpiece of claim 1 in which said tubular member is transparent elastomeric material.
Claim 6
Independent Claim
106 words
A method of using a spray shield on a dental handpiece comprising the steps of (a) providing said spray shield in the form of a tubular member (b) adapting a first portion of said tubular member to be attached to a working end of said dental handpiece (c) attaching said tubular member to said working end of said dental handpiece such that a second portion of said tubular member extends a distance beyond said working end, and (d) establishing the length of said second portion to be substantially an optimal working distance of said working end of said handpiece from a working area in the mouth.
Claim 7
Independent Claim
106 words
A method of using a spray shield on a dental handpiece comprising the steps of (a) providing said spray shield in the form of a tubular member (b) adapting a first portion of said tubular member to be attached to a working end of said dental handpiece (c) attaching said tubular member to said working end of said dental handpiece such that a second portion of said tubular member extends a distance beyond said working end, and (d) establishing the length of said second portion to be substantially an optimal working distance of said working end of said handpiece from a working area in the mouth.
Claim 8
Dependent Claim
59 words
The method of claim 5 which comprises the further steps of (a) pressing said second portion of said spray shield at an angle against and directed away from gingival tissue or restorative material and (b) activating an air-abrasive powder/water spray to affect cleaning of a tooth surface while preventing damage to said gingival tissue or to said restorative material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |