Patent US4793807A successfully refreshed from Google Patents.
US4793807A
Expired / Lapsed
US
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Method for supplying a heated liquid
Assignee: NATIONAL PATENT DENTAL PRODUCTS Inc
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Filing: 1987-06-17
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Granted: 1988-12-27
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Expires: 2007-06-17
Abstract
Abstract An improved method and apparatus for effecting delivery of a chemical solution useful in the softening of tooth caries and/or plaque in a patient's mouth utilizes a reciprocating piston-type pump having flow and pressure regulation for injecting a pulsating jet stream of the solution at a controlled rate and pressure, in combination with a separate heater device adjacent an applicator maintaining the temperature of the solution at or near body temperature as it is delivered to the mouth.
Inventors
- 👤 Aaron Friedman
- 👤 H. Gordon Minns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:36
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/0061; A61C1/0084; A61C1/0092; A61C17/00; A61C17/16; A61C17/20; A61C19/00; A61C19/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
199 words
A method for heating a solution for the treatment of dental caries of plaque to a temperature which is at or near the normal temperature of the human body, said method comprising withdrawing said solution from a stock thereof which is at ambient temperature and passing it as a pulsating pressurized flow thereof in a closed delivery course through a heat sink receiving and storing heat from an electrically powered heating source which is remote from said closed delivery course, said heat sink having a heat capacity such that the heat sink temperature remains relatively constant both when the heat source has electrical power delivered thereto and when delivery of electrical power is interrupted so that heat stored in the heat sink transfers to the solution to raise its temperature from that at inlet to the heat sink to that higher temperature at or near normal body temperature upon its outlet from the heat sink, and sensing the temperature of the heat sink at the location at which the solution outlets therefrom to control the delivery and interruption of electrical power to the heat sink thereby to maintain the temperature of the heat sink within a predetermined temperature range.
Claim 2
Independent Claim
199 words
A method for heating a solution for the treatment of dental caries of plaque to a temperature which is at or near the normal temperature of the human body, said method comprising withdrawing said solution from a stock thereof which is at ambient temperature and passing it as a pulsating pressurized flow thereof in a closed delivery course through a heat sink receiving and storing heat from an electrically powered heating source which is remote from said closed delivery course, said heat sink having a heat capacity such that the heat sink temperature remains relatively constant both when the heat source has electrical power delivered thereto and when delivery of electrical power is interrupted so that heat stored in the heat sink transfers to the solution to raise its temperature from that at inlet to the heat sink to that higher temperature at or near normal body temperature upon its outlet from the heat sink, and sensing the temperature of the heat sink at the location at which the solution outlets therefrom to control the delivery and interruption of electrical power to the heat sink thereby to maintain the temperature of the heat sink within a predetermined temperature range.
Claim 3
Dependent Claim
27 words
The method of claim 1 in which the predetermined temperature range within which the heat sink temperature is maintained is about 90° F. to about 105° F.
Claim 4
Dependent Claim
22 words
The method of claim 1 in which the solution flow is pressurized to a pressure of about 10 to about 15 psi
Claim 5
Dependent Claim
25 words
The method of claim 1 in which the solution flow is pulsed at a pulsation frequency of about 1000 to about 1600 cycles per minute.
Claim 6
Dependent Claim
23 words
The method of claim 1 in which the solution is passed through the heat sink at a flow rate of about 35 ml/min.
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) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |