Patent US3247580A successfully refreshed from Google Patents.
US3247580A
Expired / Lapsed
US
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Method of making screw pumps
Assignee: IMO Industries Inc
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Filing: 1962-05-09
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Granted: 1966-04-26
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Morgan B Sennet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:54
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; F04C2/165; B; B23; B23F; B23F15/00; B23F15/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49242; Y10T407/00; Y10T407/15; Y10T407/16; Y10T409/00; Y10T409/40; Y10T409/400175
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF MAKING A HOUSING FOR A SCREW PUMP OR MOTOR OF THE TYPE HAVING INTERMESHING SCREWS COMPRISING A POWER SCREW HAVING CONVEX THREADS AND AT LEAST ONE IDLER SCREW HAVING CONCAVE THREADS AND A HOUSING HAVING INTERSECTING CYLINDRICAL BORES WITHIN WHICH SAID SCREWS ROTATE, THE METHOD COMPRISING FORMING BY EXTRUSION OF METAL THE HOUSING WITH UNDERSIZED INTERSECTING APPROXIMATELY CYLINDRICAL BORES AND THEN SIMULTANEOUSLY BROACHING SAID BORES TO FINISHED DIMENSIONS BY PASSING THERETHROUGH A BROACH HAVING A MULTILOBED FORM CORRESPONDING TO THE MULTILOBED FORM OF THE INTERSECTING BORES.
Claim 2
Independent Claim
89 words
THE METHOD OF MAKING A HOUSING FOR A SCREW PUMP OR MOTOR OF THE TYPE HAVING INTERMESHING SCREWS COMPRISING A POWER SCREW HAVING CONVEX THREADS AND AT LEAST ONE IDLER SCREW HAVING CONCAVE THREADS AND A HOUSING HAVING INTERSECTING CYLINDRICAL BORES WITHIN WHICH SAID SCREWS ROTATE, THE METHOD COMPRISING FORMING BY EXTRUSION OF METAL THE HOUSING WITH UNDERSIZED INTERSECTING APPROXIMATELY CYLINDRICAL BORES AND THEN SIMULTANEOUSLY BROACHING SAID BORES TO FINISHED DIMENSIONS BY PASSING THERETHROUGH A BROACH HAVING A MULTILOBED FORM CORRESPONDING TO THE MULTILOBED FORM OF THE INTERSECTING BORES.
References Cited (Backward Citations)
USRE18458E
Cited
US1028036A
Cited
US2642003A
Cited
US2724173A
Cited
US2693763A
Cited
US2827687A
Cited
US2924181A
Cited
US2987801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |