US3307453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw rotor machines for expanding a gaseous working medium of high temperature
Assignee: Svenska Rotor Maskiner AB
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Filing: 1965-02-25
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Granted: 1967-03-07
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Expires: 1985-02-25
Abstract
No abstract record available.
Inventors
- 👤 Nilsson Hans Robert
- 👤 Schibbye Lauritz Benedictus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:29
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/14; F01C1/16; F02; F02B; F02B53/00; F02B2730/00; F02B2730/05; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN SCREW ROTOR MACHINE APPARATUS OF THE CHARACTER DESCRIBED FOR EXPANDING A HIGH TEMPERATURE GASEOUS MEDIUM AND HAVING A METALLIC CASING WITH A WORKING SPACE THEREIN CONSISTING OF TWO INTERSECTING BORES, AND END WALL AT EACH END THEREOF, AN INLET AND AN OUTLET, A MALE ROTOR ROTATABLY MOUNTED IN ONE OF SAID BORES AND A FEMALE ROTOR IN THE OTHER SAID BORE WITH SAID ROTORS MESHING WITH EACH OTHER, THE COMBINATION WHICH COMPRISES CERAMIC MATERIAL DISPOSED ON ALL THE SURFACES OF SAID WORKING SPACE, SAID END WALLS AND SAID ROTORS WHICH ARE EXPOSED TO SAID HIGH TEMPERATURE WORKING MEDIUM, WITH SAID CERAMIC MATERIAL HAVING A COEFFICIENT OF THERMAL EXPANSION OF LESS THAN 3 X 10-6, SYNCHRONIZING GEAR MEANS FOR INTERCONNECTING SAID MALE AND SAID FEMALE ROTORS OUTSIDE SAID WORKING SPACE, AND COOLING MEANS IN SAID METALLIC CASING FOR COOL-
Claim 2
Dependent Claim
139 words
IN SCREW ROTOR MACHINE APPARATUS OF THE CHARACTER DESCRIBED FOR EXPANDING A HIGH TEMPERATURE GASEOUS MEDIUM AND HAVING A METALLIC CASING WITH A WORKING SPACE THEREIN CONSISTING OF TWO INTERSECTING BORES, AND END WALL AT EACH END THEREOF, AN INLET AND AN OUTLET, A MALE ROTOR ROTATABLY MOUNTED IN ONE OF SAID BORES AND A FEMALE ROTOR IN THE OTHER SAID BORE WITH SAID ROTORS MESHING WITH EACH OTHER, THE COMBINATION WHICH COMPRISES CERAMIC MATERIAL DISPOSED ON ALL THE SURFACES OF SAID WORKING SPACE, SAID END WALLS AND SAID ROTORS WHICH ARE EXPOSED TO SAID HIGH TEMPERATURE WORKING MEDIUM, WITH SAID CERAMIC MATERIAL HAVING A COEFFICIENT OF THERMAL EXPANSION OF LESS THAN 3 X 10-6, SYNCHRONIZING GEAR MEANS FOR INTERCONNECTING SAID MALE AND SAID FEMALE ROTORS OUTSIDE SAID WORKING SPACE, AND COOLING MEANS IN SAID METALLIC CASING FOR COOL-
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |