US4712589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipment for the handling of substances made fluid by heating, in particular wax for models
Assignee: Individual
•
Filing: 1986-02-18
•
Granted: 1987-12-15
•
Expires: 2006-02-18
Abstract
Abstract An apparatus for handling substances which are rendered fluid by heating, such as wax, the apparatus including a body defining a chamber having opposite walls and a filter therebetween separating the chamber into a liquid chamber and an air chamber, openings for introducing air into and withdrawing air from the air chamber, openings for drawing liquid into and ejecting liquid from the liquid chamber in response to the respective withdrawal and introduction of air into the air chamber, a resistor in the liquid chamber for maintaining substances therein liquid, the resistor being housed in a tube extending between the walls and through the filter having at least one bore for placing the tube in fluid communication with the liquid chamber, a hand piece, a duct in the hand piece, and a part of the resistor and a short tubular element maintaining the body and hand piece in coupled but readily decoupled relationship.
Inventors
- 👤 Giovanni De Gaspari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:04
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
Apparatus for handling a liquid through the selective utilization of negative and positive air pressure comprising a body defining a chamber, filter means for separating said chamber into a liquid chamber and an air chamber, said filter means further precluding the passing of liquid therethrough, means for introducing air into and withdrawing air from said air chamber, means for drawing liquid into and ejecting liquid from said liquid chamber in response to the respective withdrawal and introducing of air into said air chamber, means for heating the liquid while in the liquid chamber, a tube within at least said liquid chamber in fluid communication with said liquid drawing and ejecting means, and at least one bore in said tube placing said tube in fluid communication with said liquid chamber.
Claim 2
Dependent Claim
129 words
Apparatus for handling a liquid through the selective utilization of negative and positive air pressure comprising a body defining a chamber, filter means for separating said chamber into a liquid chamber and an air chamber, said filter means further precluding the passing of liquid therethrough, means for introducing air into and withdrawing air from said air chamber, means for drawing liquid into and ejecting liquid from said liquid chamber in response to the respective withdrawal and introducing of air into said air chamber, means for heating the liquid while in the liquid chamber, a tube within at least said liquid chamber in fluid communication with said liquid drawing and ejecting means, and at least one bore in said tube placing said tube in fluid communication with said liquid chamber.
Claim 3
Dependent Claim
19 words
The apparatus as defined in claim 1 wherein said heating means is at least partially housed within said tube.
Claim 4
Dependent Claim
30 words
The apparatus as defined in claim 2 wherein said body includes opposite walls in part accommodating said respective air introducing and withdrawing means and said liquid drawing and ejecting means.
Claim 5
Dependent Claim
40 words
The apparatus as defined in claim 2 wherein said body includes opposite walls in part accommodating said respective air introducing and withdrawing means and said liquid drawing and ejecting means, and said filter means being disposed between said opposite walls.
Claim 6
Dependent Claim
37 words
The apparatus as defined in claim 2 wherein said body includes opposite walls in part accommodating said respective air introducing and withdrawing means and said liquid drawing and ejecting means and said tube spans said opposite walls.
Claim 7
Dependent Claim
55 words
The apparatus as defined in claim 2 wherein said body includes opposite walls in part accommodating said respective air introducing and withdrawing means and said liquid drawing and ejecting means, said tube spans said opposite walls, and said heating means is slidably introduced into said tube from the exterior of one of said opposite walls.
Claim 8
Dependent Claim
45 words
The apparatus as defined in claim 2 including a hand piece, means for removably coupling said body to said hand piece, and said removable coupling means being defined in part by a tubular element between said hand piece and said air introducing and withdrawing means.
Claim 9
Dependent Claim
43 words
The apparatus as defined in claim 2 including a hand piece, means for removably coupling said body to said hand piece, and said removable coupling means being defined in part by a projecting end of said heating means connected to said hand piece.
Claim 10
Dependent Claim
44 words
The apparatus as defined in claim 2 including a hand piece, means for removably coupling said body to said hand piece, and said removable coupling means being defined in part by a projecting end of said heating means slidably connected to said hand piece.
Claim 11
Dependent Claim
57 words
The apparatus as defined in claim 2 including a hand piece, means for removably coupling said body to said hand piece, and said removable coupling means being defined in part by a projecting end of said heating means connected to said hand piece and by a projecting end of said heating means connected to said hand piece.
Claim 12
Dependent Claim
135 words
Apparatus for handling a liquid through the selective utilization of negative and positive air pressure comprising a body defining a chamber, filter means for separating said chamber into a liquid chamber and an air chamber, said filter means further precluding the passing of liquid therethrough, means for introducing air into and withdrawing air from said air chamber, means for drawing liquid into and ejecting liquid from said liquid chamber in response to the respective withdrawal and introducing of air into said air chamber, means for heating the liquid while in the liquid chamber, a hand piece, a duct in said hand piece connected to said air introducing and withdrawing means, means for selectively regulating the passage of air through said duct, and a tubular element connecting said duct to said air introducing and withdrawing means.
Claim 13
Dependent Claim
135 words
Apparatus for handling a liquid through the selective utilization of negative and positive air pressure comprising a body defining a chamber, filter means for separating said chamber into a liquid chamber and an air chamber, said filter means further precluding the passing of liquid therethrough, means for introducing air into and withdrawing air from said air chamber, means for drawing liquid into and ejecting liquid from said liquid chamber in response to the respective withdrawal and introducing of air into said air chamber, means for heating the liquid while in the liquid chamber, a hand piece, a duct in said hand piece connected to said air introducing and withdrawing means, means for selectively regulating the passage of air through said duct, and a tubular element connecting said duct to said air introducing and withdrawing means.
References Cited (Backward Citations)
US897782A
Cited
US2994349A
Cited
US3406875A
Cited
US3665158A
Cited
US3882909A
Cited
US3963061A
Cited
US4176693A
Cited
US4360046A
Cited
US4485831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |