Patent US4441781A successfully refreshed from Google Patents.
US3844702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal casting and curing apparatus
Assignee: Nobilium Products Inc
•
Filing: 1972-12-04
•
Granted: 1974-10-29
•
Expires: 1992-12-04
Abstract
Abstract An apparatus for simultaneous centrifugally casting a plurality of objects such as dental restorations and for curing the cast objects is disclosed. The casting and curing are performed in the same pressure vessel, eliminating the need to move the newly cast objects before curing. The curing is performed in an automatically controlled environment under pressure; water is used to evenly distribute heat during the curing.
Inventors
- 👤 C Dimmer
- 👤 E Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:17
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/20; B; B29; B29C; B29C35/00; B29C35/02; B29C35/0227; B29C35/04; B29C39/00; B29C39/02; B29C39/04; B29C39/08; B29C39/22; B29C39/38; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; B29L2031/7536
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
144 words
An apparatus for centrifugal casting and for curing dental restorations comprising: a housing defining a pressure vessel; a rotor assembly for rotation disposed within said housing for centrifugally casting said dental restorations; water flow control means for permitting water to enter said pressure vessel for curing said dental restorations after casting and to be drained from said pressure vessel coupled to said housing; heating means for heating water in said vessel; gas flow control means for permitting gas to enter and leave said pressure vessel such that said vessel may be pressurized for curing said dental restorations; and, a flask including a plurality of sections for receiving dental restoration molds coupled to said rotor assembly for rotation with said assembly during said centrifugal casting; whereby a plurality of dental restorations may be centrifugally cast simultaneously in said flask and then cured in said vessel.
Claim 2
Independent Claim
144 words
An apparatus for centrifugal casting and for curing dental restorations comprising: a housing defining a pressure vessel; a rotor assembly for rotation disposed within said housing for centrifugally casting said dental restorations; water flow control means for permitting water to enter said pressure vessel for curing said dental restorations after casting and to be drained from said pressure vessel coupled to said housing; heating means for heating water in said vessel; gas flow control means for permitting gas to enter and leave said pressure vessel such that said vessel may be pressurized for curing said dental restorations; and, a flask including a plurality of sections for receiving dental restoration molds coupled to said rotor assembly for rotation with said assembly during said centrifugal casting; whereby a plurality of dental restorations may be centrifugally cast simultaneously in said flask and then cured in said vessel.
Claim 3
Dependent Claim
154 words
A casting and curing apparatus for simultaneously centrifugally casting and then curing a plurality of dental restorations comprising; a pressure vessel which includes a manually removable lid; a motor and rotor assembly, said rotor assembly being disposed within said vessel; a flask coupled to said rotor assembly for rotation with said rotor assembly, said flask including a plurality of separate areas for receiving a plurality of dental restoration molds and which includes a central area into which a casting material may be poured; flow control means for controlling the flow of gas and water into and out of said vessel for curing said dental restorations after casting; and, heating means, coupled to saiD vessel for heating the water in said vessel when said dental restorations are being cured; whereby a plurality of dental restorations may be simultaneously cast in said flask and then cured in said vessel with the use of pressure and heat.
Claim 4
Dependent Claim
154 words
A casting and curing apparatus for simultaneously centrifugally casting and then curing a plurality of dental restorations comprising; a pressure vessel which includes a manually removable lid; a motor and rotor assembly, said rotor assembly being disposed within said vessel; a flask coupled to said rotor assembly for rotation with said rotor assembly, said flask including a plurality of separate areas for receiving a plurality of dental restoration molds and which includes a central area into which a casting material may be poured; flow control means for controlling the flow of gas and water into and out of said vessel for curing said dental restorations after casting; and, heating means, coupled to saiD vessel for heating the water in said vessel when said dental restorations are being cured; whereby a plurality of dental restorations may be simultaneously cast in said flask and then cured in said vessel with the use of pressure and heat.
Claim 5
Dependent Claim
37 words
The apparatus defined in claim 2 including control means for automatically controlling the temperature of water in said vessel by selectively operating said heating means and for deactivating said heating means after a predetermined period of time.
Claim 6
Dependent Claim
19 words
The apparatus defined in claim 3 including motor control means for controlling the rate of rotation of said rotor.
Claim 7
Independent Claim
166 words
An apparatus for simultaneously casting and simultaneously curing a plurality of dental restorations comprising: a housing; a pressure vessel mounted within said housing; a rotor mounted for rotation in said vessel; a motor mounted in said housing; a drive shaft means interconnecting said motor and rotor such that said rotor may be rotated for centrifugal casting of said dental restorations; a source of gas; gas flow control means coupled to said housing and interconnecting said source of gas with said vessel for controlling the flow of gas into said vessel for curing said dental restorations; liquid flow control means, coupled to said housing for controlling the flow of liquid into said vessel for curing said dental restorations after casting; heater means mounted in said vessel for heating liquid in said vessel; and holder means, for securing a plurality of molds to said rotor, for rotation with said rotor; whereby a plurality of restorations may be cast within said molds and then cured in said pressure vessel.
Claim 8
Independent Claim
166 words
An apparatus for simultaneously casting and simultaneously curing a plurality of dental restorations comprising: a housing; a pressure vessel mounted within said housing; a rotor mounted for rotation in said vessel; a motor mounted in said housing; a drive shaft means interconnecting said motor and rotor such that said rotor may be rotated for centrifugal casting of said dental restorations; a source of gas; gas flow control means coupled to said housing and interconnecting said source of gas with said vessel for controlling the flow of gas into said vessel for curing said dental restorations; liquid flow control means, coupled to said housing for controlling the flow of liquid into said vessel for curing said dental restorations after casting; heater means mounted in said vessel for heating liquid in said vessel; and holder means, for securing a plurality of molds to said rotor, for rotation with said rotor; whereby a plurality of restorations may be cast within said molds and then cured in said pressure vessel.
Claim 9
Dependent Claim
14 words
The apparatus defined in claim 5 wherein said vessel includes a manually removable lid.
Claim 10
Dependent Claim
16 words
The apparatus defined in claim 6 wherein said holder means is removably mounted on said rotor.
Claim 11
Dependent Claim
19 words
The apparatus defined in claim 7 including motor control means for controlling the rate of rotation of said rotor.
Claim 12
Dependent Claim
74 words
The apparatus defined in claim 5 wherein said holder means comprises: a first plate; a casting flask, for engaging said first plate, defining with said first plate a plurality of areas for receiving molds, and, a resin pouring plate, for engaging said casting flask, said pouring plate including an aperture into which resin may be poured, and securing means for securing said first plate, casting flask and said resin pouring plate to one another.
Claim 13
Dependent Claim
29 words
The apparatus defined in claim 9 wherein said holder means also includes a gel pouring plate having a plurality of apertures for pouring gel into said plurality of areas.
Claim 14
Dependent Claim
19 words
The apparatus defined in claim 10 wherein said first plate includes a centrally disposed aperture for receiving a plug.
Claim 15
Independent Claim
165 words
An apparatus for centrifugally casting and for curing a plurality of dental restorations comprising: a housing defining a pressure vessel; a rotor assembly disposed for rotation within said housing for centrifugally casting said dental restorations; water flow control means for permitting water to enter said pressure vessel for curing said dental restorations after said casting and to be drained from said pressure vessel, coupled to said housing; holding means, for securing a plurality of molds defining said dental restorations, said holding means comprising: a. a first plate; b. a casting flask, for engaging said first plate, defining with said first plate a plurality of areas for receiving molds; c. a resin pouring plate for receiving said casting flask, said pouring plate including an aperture into which resin may be poured; and, d. securing means for securing said first plate, casting flask and said resin pouring plate to one another; whereby a plurality of dental restorations may be simultaneously cast and then cured within said vessel.
Claim 16
Independent Claim
165 words
An apparatus for centrifugally casting and for curing a plurality of dental restorations comprising: a housing defining a pressure vessel; a rotor assembly disposed for rotation within said housing for centrifugally casting said dental restorations; water flow control means for permitting water to enter said pressure vessel for curing said dental restorations after said casting and to be drained from said pressure vessel, coupled to said housing; holding means, for securing a plurality of molds defining said dental restorations, said holding means comprising: a. a first plate; b. a casting flask, for engaging said first plate, defining with said first plate a plurality of areas for receiving molds; c. a resin pouring plate for receiving said casting flask, said pouring plate including an aperture into which resin may be poured; and, d. securing means for securing said first plate, casting flask and said resin pouring plate to one another; whereby a plurality of dental restorations may be simultaneously cast and then cured within said vessel.
Claim 17
Dependent Claim
29 words
The apparatus defined in claim 12 wherein said holding means also includes a gel pouring plate having a plurality of apertuRes for pouring gel into said plurality of areas.
Claim 18
Dependent Claim
23 words
The apparatus defined in claim 13 wherein said first plate of said holding means includes a centrally disposed aperture for receiving a plug.
References Cited (Backward Citations)
US1502435A
Cited
US1720719A
Cited
US1871137A
Cited
US2829408A
Cited
DE1217590B
Cited
US3754852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |