Patent US5312224A successfully refreshed from Google Patents.
US5312224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conical logarithmic spiral viscosity pump
Assignee: Stratasys Inc
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Filing: 1993-03-12
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Granted: 1994-05-17
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Expires: 2013-03-12
Abstract
Abstract A rotary viscosity pump is provided that has a housing and an impeller. The housing has a conical chamber with an outlet at a narrow end of the chamber. The impeller has a conical section with a logarithmic spiral groove along its exterior. The spacing between the housing and the impeller can have either a constant gap or a gap that decreases along the length of the impeller. The depth of the groove can be constant, increase, or decrease in depth along the length of the impeller.
Inventors
- 👤 John S. Batchelder
- 👤 Shawn A. Hall
- 👤 Robert R. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:12
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/181; F04D29/183; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/505; B29C48/52; B29C48/525; F04D3/00; F04D3/02; B29C45/00; B29C45/17; B29C45/46; B29C2045/465; B29C48/03; B29C48/05; B29C48/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49245
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
63 words
A viscosity pump comprising: a housing having a pump chamber and an outlet, the chamber having a section with a general conical shape, the outlet being located at a narrow end of the section; and an impeller rotatably located in the chamber, the impeller having a generally conical section with at least one logarithmic spiral groove along an exterior of the conical section.
Claim 2
Dependent Claim
63 words
A viscosity pump comprising: a housing having a pump chamber and an outlet, the chamber having a section with a general conical shape, the outlet being located at a narrow end of the section; and an impeller rotatably located in the chamber, the impeller having a generally conical section with at least one logarithmic spiral groove along an exterior of the conical section.
Claim 3
Dependent Claim
29 words
A pump as in claim 1 wherein the impeller has a front located at the outlet which is substantially smooth shaped with the groove not extending to the front.
Claim 4
Dependent Claim
24 words
A pump as in claim 1 wherein the impeller is spaced from the housing along the generally conical section with a substantially constant gap.
Claim 5
Dependent Claim
32 words
A pump as in claim 1 wherein the impeller is spaced from the housing along the generally conical section with a gap that varies along the length of the generally conical section.
Claim 6
Dependent Claim
22 words
A pump as in claim 4 wherein the groove has a depth that varies along the length of the generally conical section.
Claim 7
Dependent Claim
19 words
A pump as in claim 5 wherein the groove depth decreases along the length of the generally conical section.
Claim 8
Dependent Claim
18 words
A pump as in claim 4 wherein the gap decreases along the length of the generally conical section.
Claim 9
Dependent Claim
87 words
A rotary fluid pump comprising: a pump housing having an inlet, an outlet, and an impeller chamber therebetween, the impeller chamber including a narrowing section with a narrow end located proximate the outlet; and an impeller rotatably mounted in the impeller chamber, the impeller having a portion located in and substantially similarly shaped to the narrowing section except including a groove along its exterior having an approximate logarithmic spiral, the impeller having ridges along its exterior with a substantially constant gap between the ridges and the housing.
Claim 10
Dependent Claim
87 words
A rotary fluid pump comprising: a pump housing having an inlet, an outlet, and an impeller chamber therebetween, the impeller chamber including a narrowing section with a narrow end located proximate the outlet; and an impeller rotatably mounted in the impeller chamber, the impeller having a portion located in and substantially similarly shaped to the narrowing section except including a groove along its exterior having an approximate logarithmic spiral, the impeller having ridges along its exterior with a substantially constant gap between the ridges and the housing.
Claim 11
Dependent Claim
18 words
A pump as in claim 8 wherein the narrowing section of the chamber has a general conical shape.
Claim 12
Dependent Claim
14 words
A pump as in claim 9 wherein the impeller has a general conical shape.
Claim 13
Dependent Claim
19 words
A pump as in claim 10 wherein the impeller has a front with a cone shape without the groove.
Claim 14
Dependent Claim
21 words
A pump as in claim 8 wherein the groove has a substantially constant depth along the length of the impeller portion.
Claim 15
Dependent Claim
93 words
A rotary fluid pump comprising: a pump housing have an inlet, an outlet, and an impeller chamber therebetween, the impeller chamber including a narrowing section with a narrow end located proximate the outlet; and an impeller rotatably mounted in the impeller chamber, the impeller having a portion located in and substantially similarly shaped to the narrowing section except including a groove along its exterior having an approximate logarithmic spiral, the impeller having ridges along its exterior with a gap that varies between the ridges and the housing along the length of the impeller.
Claim 16
Dependent Claim
93 words
A rotary fluid pump comprising: a pump housing have an inlet, an outlet, and an impeller chamber therebetween, the impeller chamber including a narrowing section with a narrow end located proximate the outlet; and an impeller rotatably mounted in the impeller chamber, the impeller having a portion located in and substantially similarly shaped to the narrowing section except including a groove along its exterior having an approximate logarithmic spiral, the impeller having ridges along its exterior with a gap that varies between the ridges and the housing along the length of the impeller.
Claim 17
Dependent Claim
20 words
A pump as in claim 13 wherein the groove has a depth that varies along the length of the impeller.
Claim 18
Dependent Claim
17 words
A pump as in claim 14 wherein the groove becomes shallower along the length of the impeller.
Claim 19
Independent Claim
91 words
A method of manufacturing a viscosity pump comprising steps of: providing a housing having a pump chamber and an outlet, the chamber having a section with a general conical shape, the outlet being located at a narrow end of the section; inserting a impeller into the pump chamber, the impeller having a general conical section with at least one logarithmic spiral groove along an exterior of the impeller conical section, spacings between the impeller and housing decreasing along the length of the impeller to produce a fluid pressure (P) of ##EQU24##
Claim 20
Independent Claim
91 words
A method of manufacturing a viscosity pump comprising steps of: providing a housing having a pump chamber and an outlet, the chamber having a section with a general conical shape, the outlet being located at a narrow end of the section; inserting a impeller into the pump chamber, the impeller having a general conical section with at least one logarithmic spiral groove along an exterior of the impeller conical section, spacings between the impeller and housing decreasing along the length of the impeller to produce a fluid pressure (P) of ##EQU24##
Claim 21
Independent Claim
20 words
A system for dispensing a fluid comprising: a controller; and a conical logarithmic spiral viscosity pump connected to the controller.
Claim 22
Independent Claim
20 words
A system for dispensing a fluid comprising: a controller; and a conical logarithmic spiral viscosity pump connected to the controller.
Claim 23
Dependent Claim
17 words
A system as in claim 17 further comprising a motor connected between the controller and the pump.
Claim 24
Dependent Claim
28 words
A system as in claim 17 further comprising a pump location positioner connected to the controller and pump that is adapted to move the pump to desired locations.
Claim 25
Dependent Claim
37 words
A pumping assembly comprising: a conical logarithmic spiral viscosity pump; and a drive motor connected to an impeller of the pump, the motor being adapted to axially rotate the impeller relative to a housing of the pump.
Claim 26
Dependent Claim
37 words
A pumping assembly comprising: a conical logarithmic spiral viscosity pump; and a drive motor connected to an impeller of the pump, the motor being adapted to axially rotate the impeller relative to a housing of the pump.
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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) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |