Patent US3964112A successfully refreshed from Google Patents.
US3964112A
Expired / Lapsed
US
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Dental cuspidor with fluid recirculation system
Assignee: Dentsply Research and Development Corp
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Filing: 1975-05-27
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Granted: 1976-06-22
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Expires: 1995-05-27
Abstract
Abstract A water recirculation system is described wherein the discharge of one or more dental cuspidors is rendered reuseable and continuously used in the operation of a water sealed vacuum pump in a dental vacuum discharge system.
Inventors
- 👤 Richard E. Plowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A fluid system comprising: a. a cuspidor; b. a fresh water supply for the cuspidor; c. vacuum means for removing wastewater from said cuspidor; d. a vacuum pump for said vacuum means; e. means for rendering said wastewater reuseable; f. means for passing said wastewater into the vacuum pump while bypassing said cuspidors whereby said vacuum pump is continuously maintained in a primed condition during operation.
Claim 2
Dependent Claim
66 words
A fluid system comprising: a. a cuspidor; b. a fresh water supply for the cuspidor; c. vacuum means for removing wastewater from said cuspidor; d. a vacuum pump for said vacuum means; e. means for rendering said wastewater reuseable; f. means for passing said wastewater into the vacuum pump while bypassing said cuspidors whereby said vacuum pump is continuously maintained in a primed condition during operation.
Claim 3
Dependent Claim
12 words
The invention of claim 1 wherein the cuspidor is a dental cuspidor.
Claim 4
Dependent Claim
97 words
A fluid system for dental use comprising: a. a cuspidor; b. means for supplying fresh water into said cuspidor; c. a drain for removing wastewater from said cuspidor; d. suction means connected to said cuspidor drain for assisting in the evacuation of wastewater from said cuspidor; e. a vacuum pump for said suction means, said vacuum pump having an inlet and an outlet for wastewater; f. means for returning at least a portion of the wastewater initially discharged through the outlet of the vacuum pump to the inlet of said pump without first passing through the cuspidor.
Claim 5
Dependent Claim
97 words
A fluid system for dental use comprising: a. a cuspidor; b. means for supplying fresh water into said cuspidor; c. a drain for removing wastewater from said cuspidor; d. suction means connected to said cuspidor drain for assisting in the evacuation of wastewater from said cuspidor; e. a vacuum pump for said suction means, said vacuum pump having an inlet and an outlet for wastewater; f. means for returning at least a portion of the wastewater initially discharged through the outlet of the vacuum pump to the inlet of said pump without first passing through the cuspidor.
Claim 6
Dependent Claim
15 words
The invention of claim 3 wherein the return means includes an air and water separator.
Claim 7
Dependent Claim
14 words
The invention of claim 3 wherein the return means includes a particle filter means.
Claim 8
Dependent Claim
16 words
The invention of claim 3 wherein the return means includes a water pump and pressure tank.
References Cited (Backward Citations)
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US3226733A
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US3440669A
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US3613131A
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US3653078A
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US3842448A
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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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |