Patent US3289501A successfully refreshed from Google Patents.
US3289501A
Expired / Lapsed
US
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Method of machining a pump stator
Assignee: Welch Scientific Co
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Filing: 1964-10-15
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Granted: 1966-12-06
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Expires: 1984-10-15
Abstract
No abstract record available.
Inventors
- 👤 Dubrovin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:38
CPC Classifications
B; B23; B23Q; B23Q27/00; B23Q27/003; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49995; Y10T29/49996; Y10T408/00; Y10T408/03; Y10T408/34; Y10T408/352; Y10T408/39; Y10T409/00; Y10T409/30; Y10T409/303752; Y10T409/303808; Y10T409/304424
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
THE METHOD OF FINAL SHAPING OF THE CAVITY OF A HIGH VACUUM PUMP STATOR, WHICH STATOR IS INITIALLY FORMED WITH A CYLINDRICAL BORE WHICH IN TURN IS TO BE ENLARGED TO DEFINE AN ELLIPTICAL CAVITY AND THEREAFTER PROVIDED WITH AN ARCUATE SEAT INTERRUPTING BUT CLOSELY MERGING WITH THE SURFACE OF THE ELLIPTICAL CAVITY AND HAVING A SINGLE RADIUS WITH ITS CENTER COINCIDING WITH THE CENTER OF ROTATION OF A VANECARRYING PUMP ROTOR TO BE RECEIVED IN SAID CAVITY UPON SUBSEQUENT ASSEMBLY OF SAID PUMP, SAID METHOD COMPRISING INTRODUCING A FIRST BORING MEANS INTO SAID CYLINDRICAL BORE OF SAID STATOR ALONG A FIRST AXIS COINCIDING WITH THE GEOMETRIC CENTER OF SAID CYLINDRICAL BORE, ROTATING SAID FIRST BORING MEANS DURING SAID INTRODUCTION ABOUT A SECOND AXIS WHICH IS IN ACUTE ANGULAR RELATION TO SAID FIRST AXIS AND RESHAPING SAID CYLINDRICAL BORE INTO AN ELLIPSE HAVING A GEOMETRIC CENTER WHICH IS COMMON WITH THAT OF SAID CYLINDRICAL BORE, SEPARATING SAID FIRST BORING MEANS
Claim 2
Independent Claim
160 words
THE METHOD OF FINAL SHAPING OF THE CAVITY OF A HIGH VACUUM PUMP STATOR, WHICH STATOR IS INITIALLY FORMED WITH A CYLINDRICAL BORE WHICH IN TURN IS TO BE ENLARGED TO DEFINE AN ELLIPTICAL CAVITY AND THEREAFTER PROVIDED WITH AN ARCUATE SEAT INTERRUPTING BUT CLOSELY MERGING WITH THE SURFACE OF THE ELLIPTICAL CAVITY AND HAVING A SINGLE RADIUS WITH ITS CENTER COINCIDING WITH THE CENTER OF ROTATION OF A VANECARRYING PUMP ROTOR TO BE RECEIVED IN SAID CAVITY UPON SUBSEQUENT ASSEMBLY OF SAID PUMP, SAID METHOD COMPRISING INTRODUCING A FIRST BORING MEANS INTO SAID CYLINDRICAL BORE OF SAID STATOR ALONG A FIRST AXIS COINCIDING WITH THE GEOMETRIC CENTER OF SAID CYLINDRICAL BORE, ROTATING SAID FIRST BORING MEANS DURING SAID INTRODUCTION ABOUT A SECOND AXIS WHICH IS IN ACUTE ANGULAR RELATION TO SAID FIRST AXIS AND RESHAPING SAID CYLINDRICAL BORE INTO AN ELLIPSE HAVING A GEOMETRIC CENTER WHICH IS COMMON WITH THAT OF SAID CYLINDRICAL BORE, SEPARATING SAID FIRST BORING MEANS
References Cited (Backward Citations)
US726662A
Cited
US2887912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |