Patent US3822972A successfully refreshed from Google Patents.
US3822972A
Expired / Lapsed
US
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Multistart helical rotor mechanism
Assignee: VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY INSTITUT BUROVOI TEKHNIKI
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Filing: 1972-11-20
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Granted: 1974-07-09
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Expires: 1992-11-20
Abstract
Abstract Proposed geometrical parameters of a multi-start helical rotor mechanism, which can be used both as the working member of hydraulic or neumatic machines and as a reducing device, permit the obtaining of a minimum contact pressure and provide enhanced smoothness of the engagement between the helical surfaces of the rotor and stator of the rotor mechanism.
Inventors
- 👤 A Ogly
- 👤 A Kochney
- 👤 S Nikomarov
- 👤 D Baldenko
- 👤 M Gusman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:22
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/10; F01C1/101; E; E21; E21B; E21B4/00; E21B4/02; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
A multistart helical rotor mechanism as claimed in claim 1, wherein the ratio between the amount of eccentricity and the radius of the conventional circle is within the range of 0.9 to 0.98.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |