US3628894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-vacuum mechanical pump
Assignee: Bendix Corp
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Filing: 1970-09-15
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Granted: 1971-12-21
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Expires: 1990-09-15
Abstract
Abstract A new type multistage molecular drag pump wherein the pumping chamber contains rotating surfaces having an area much greater than the stationary surface area of the pumping chamber.
Inventors
- 👤 John H Ferguson Jr
- 👤 Frank Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:45
CPC Classifications
F; F04; F04D; F04D19/00; F04D19/02; F04D19/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
160 words
An apparatus which comprises: a housing having an inlet, an outlet, a first chamber and a second cylindrically shaped chamber having an opening communicating with said first chamber and said inlet; a rotor disposed in said second cylindrically shaped chamber so that the longitudinal axis of said rotor is disposed longitudinally of said cylindrically shaped chamber; a plurality of disks mounted in spaced relationship on said rotor so that the axis of said disks coincide with the longitudinal axis of said rotor and wherein the ratio R/D is less than 3 where D is the depth of the space between said disks and R is the radius of said second cylindrically shaped chamber; means for dividing said first chamber into a plurality of sections each of which communicates with said second chamber; a plurality of members mounted inside said housing which extends between said rotor disks; and means for rotating said rotor whereby said disks rotate within said second chamber.
Claim 2
Independent Claim
160 words
An apparatus which comprises: a housing having an inlet, an outlet, a first chamber and a second cylindrically shaped chamber having an opening communicating with said first chamber and said inlet; a rotor disposed in said second cylindrically shaped chamber so that the longitudinal axis of said rotor is disposed longitudinally of said cylindrically shaped chamber; a plurality of disks mounted in spaced relationship on said rotor so that the axis of said disks coincide with the longitudinal axis of said rotor and wherein the ratio R/D is less than 3 where D is the depth of the space between said disks and R is the radius of said second cylindrically shaped chamber; means for dividing said first chamber into a plurality of sections each of which communicates with said second chamber; a plurality of members mounted inside said housing which extends between said rotor disks; and means for rotating said rotor whereby said disks rotate within said second chamber.
Claim 3
Dependent Claim
53 words
An apparatus as recited in claim 1 wherein the ratio A1/A2 is greater than 0.5 but less than 2, where A1 is the cross-sectional area of the inlet to said housing and A2 is the cross-sectional area of said opening between said second cylindrical chamber and the first section of said first chamber.
Claim 4
Dependent Claim
26 words
An apparatus as recited in claim 1 wherein said means for rotating said rotor includes a motor disposed in said second cylindrical chamber of said housing.
Claim 5
Dependent Claim
53 words
An apparatus as recited in claim 3 wherein the ratio A1/A2 is greater than 0.5 but less than 2 where A1 is the cross-sectional area of the inlet to said housing and A2 is the cross-sectional area of said opening between said second cylindrical chamber and the first section of said first chamber.
Claim 6
Dependent Claim
274 words
A molecular pump comprising: a housing having a first chamber, a second cylindrically shaped chamber adjacent said first chamber, said chambers communicating with each other through a common opening, and an inlet for introducing molecules into one end of said first chamber and an outlet for discharging molecules from the other end of said first chamber; a rotor disposed axially of said second cylindrically shaped chamber; a plurality of disks mounted in spaced relationship on said rotor and extending across the common opening between said first and second chambers, said disks mounted so that R/D is less than 3 where D is the depth of the space between said disks and R is the radius of said second cylindrically shaped chamber; means for dividing the common opening between said chambers into two parts, said dividing means having a plurality of spaced members which extend into said second chamber and between said disks to block the passage of molecules and divert molecules into said first chamber; means for dividing said first chamber into a plurality of sections each of which communicates with said second chamber, said sections including a first section which communicates with said housing inlet and a last section which communicates with said housing outlet; and means for rotating said rotor whereby molecules entering through said housing inlet into said first section of said first chamber pass into said second chamber and are caused to travel through said second chamber by impinging some of said rotating disks until said common opening and are thereby directed into each succeeding secTion of said first chamber until said molecules pass out of said housing discharge outlet.
Claim 7
Dependent Claim
274 words
A molecular pump comprising: a housing having a first chamber, a second cylindrically shaped chamber adjacent said first chamber, said chambers communicating with each other through a common opening, and an inlet for introducing molecules into one end of said first chamber and an outlet for discharging molecules from the other end of said first chamber; a rotor disposed axially of said second cylindrically shaped chamber; a plurality of disks mounted in spaced relationship on said rotor and extending across the common opening between said first and second chambers, said disks mounted so that R/D is less than 3 where D is the depth of the space between said disks and R is the radius of said second cylindrically shaped chamber; means for dividing the common opening between said chambers into two parts, said dividing means having a plurality of spaced members which extend into said second chamber and between said disks to block the passage of molecules and divert molecules into said first chamber; means for dividing said first chamber into a plurality of sections each of which communicates with said second chamber, said sections including a first section which communicates with said housing inlet and a last section which communicates with said housing outlet; and means for rotating said rotor whereby molecules entering through said housing inlet into said first section of said first chamber pass into said second chamber and are caused to travel through said second chamber by impinging some of said rotating disks until said common opening and are thereby directed into each succeeding secTion of said first chamber until said molecules pass out of said housing discharge outlet.
Claim 8
Dependent Claim
53 words
An apparatus as recited in claim 5 wherein the ratio A1/A2 is greater than 0.5 but less than 2 where A1 is the cross-sectional area of the inlet to said housing and A2 is the cross-sectional area of said opening between said second cylindrical chamber and the first section of said first chamber.
Claim 9
Dependent Claim
26 words
An apparatus as recited in claim 5 wherein said means for rotating said rotor includes a motor disposed in said second cylindrical chamber of said housing.
Claim 10
Dependent Claim
53 words
An apparatus as recited in claim 7 wherein the ratio A1/A2 is greater than 0.5 but less than 2 where A1 is the cross-sectional area of the inlet to said housing and A2 is the cross-sectional area of said opening between said second cylindrical chamber and the first section of said first chamber.
Claim 11
Independent Claim
274 words
An apparatus for transmitting molecules which comprises: a housing which includes: a first chamber having an inlet for receiving air molecules and an outlet for discharging air molecules; and a second cylindrical chamber eccentrically arranged with said first chamber so that said chambers have a coincident portion; a plurality of members for dividing said first chamber into compartments including a first compartment which communicates with said housing inlet and a last compartment which communicates with said housing outlet, said compartments communicating with said cylindrical chamber; a rotor disposed in said cylindrical chamber so that the longitudinal axis of said rotor coincides with the longitudinal axis of said cylindrical chamber; a plurality of disks mounted in spaced relationship on said rotor; means for rotating said rotating said rotor including a motor disposed in said second cylindrical chamber; a plurality of members for blocking the passage of molecules mounted in said housing and extending between said rotor disks, said members arranged in spaced relationship in said coincident portion of said housing cavity so that when said disks are rotated air molecules entering said first chamber on one side of one of said dividing members impinge some of said disks and are caused to travel in a path which takes the molecules through said cylindrical chamber until they strike some of said blocking members which cause the molecules to reenter said first chamber on the other side of said dividing member where the molecules strike other of said disks and reenter said cylindrical chamber, the molecules repeating this type of path through said chambers until they reach the housing outlet in said first chamber and are discharged.
Claim 12
Independent Claim
274 words
An apparatus for transmitting molecules which comprises: a housing which includes: a first chamber having an inlet for receiving air molecules and an outlet for discharging air molecules; and a second cylindrical chamber eccentrically arranged with said first chamber so that said chambers have a coincident portion; a plurality of members for dividing said first chamber into compartments including a first compartment which communicates with said housing inlet and a last compartment which communicates with said housing outlet, said compartments communicating with said cylindrical chamber; a rotor disposed in said cylindrical chamber so that the longitudinal axis of said rotor coincides with the longitudinal axis of said cylindrical chamber; a plurality of disks mounted in spaced relationship on said rotor; means for rotating said rotating said rotor including a motor disposed in said second cylindrical chamber; a plurality of members for blocking the passage of molecules mounted in said housing and extending between said rotor disks, said members arranged in spaced relationship in said coincident portion of said housing cavity so that when said disks are rotated air molecules entering said first chamber on one side of one of said dividing members impinge some of said disks and are caused to travel in a path which takes the molecules through said cylindrical chamber until they strike some of said blocking members which cause the molecules to reenter said first chamber on the other side of said dividing member where the molecules strike other of said disks and reenter said cylindrical chamber, the molecules repeating this type of path through said chambers until they reach the housing outlet in said first chamber and are discharged.
Claim 13
Dependent Claim
37 words
An apparatus as recited in claim 9 wherein the ratio R/D is less than 3 where D is the depth of the space between said disks and R is the radius of said second cylindrically shaped chamber.
Claim 14
Dependent Claim
53 words
An apparatus as recited in claim 9 wherein the ratio A1/A2 is greater than 0.5 but less than 2 where A1 is the cross-sectional area of the inlet to said housing and A2 is the cross-sectional area of said opening between said second cylindrical chamber and the first section of said first chamber.
Claim 15
Dependent Claim
53 words
An apparatus as recited in claim 10 wherein the ratio A1/A2 is greater than 0.5 but less than 2 where A1 is the cross-sectional area of the inlet to said housing and A2 is the cross-sectional area of said opening between said second cylindrical chamber and the first section of said first chamber.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |