Patent US3307777A successfully refreshed from Google Patents.
US3307777A
Expired / Lapsed
US
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Screw rotor machine with an elastic working fluid
Assignee: Svenska Rotor Maskiner AB
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Filing: 1964-12-22
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Granted: 1967-03-07
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Expires: 1984-12-22
Abstract
No abstract record available.
Inventors
- 👤 Schibbye Lauritz Benedictus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:56
CPC Classifications
F; F04; F04C; F04C23/00; F04C23/001; F04C18/00; F04C18/08; F04C18/082; F04C18/084; F04C18/12; F04C18/14; F04C18/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A TWO STAGE COMPRESSOR OF THE SCREW ROTOR TYPE HAVING LOW AND HIGH PRESSURE STAGES ARRANGED IN TANDEM AND WITH EACH STAGE COMPRISING MALE AND FEMALE ROTORS WITH COPLANAR AXES AND INTERMESHING HELICAL LANDS AND GROOVES ENCLOSED IN PORTED CASING STRUCTURE PROVIDING FOR FLOW OF WORKING FLUID SERIALLY THROUGH SAID STAGES FROM A LOW PRESSURE INLET TO A HIGH PRESSURE OUTLET, THE MALE ROTOR OF ONE OF SAID STAGES BEING CONNECTED TO THE FEMALE ROTOR OF THE OTHER OF SAID STAGES TO CAUSE THE CONNECTED ROTORS TO ROTATE AT THE SAME SPEED, AND AN EXTERNAL DRIVING CONNECTION FOR DRIVING ONE OF SAID CONNECTED ROTORS.
Claim 2
Dependent Claim
104 words
A TWO STAGE COMPRESSOR OF THE SCREW ROTOR TYPE HAVING LOW AND HIGH PRESSURE STAGES ARRANGED IN TANDEM AND WITH EACH STAGE COMPRISING MALE AND FEMALE ROTORS WITH COPLANAR AXES AND INTERMESHING HELICAL LANDS AND GROOVES ENCLOSED IN PORTED CASING STRUCTURE PROVIDING FOR FLOW OF WORKING FLUID SERIALLY THROUGH SAID STAGES FROM A LOW PRESSURE INLET TO A HIGH PRESSURE OUTLET, THE MALE ROTOR OF ONE OF SAID STAGES BEING CONNECTED TO THE FEMALE ROTOR OF THE OTHER OF SAID STAGES TO CAUSE THE CONNECTED ROTORS TO ROTATE AT THE SAME SPEED, AND AN EXTERNAL DRIVING CONNECTION FOR DRIVING ONE OF SAID CONNECTED ROTORS.
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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) | 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 |