US3238882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical pump
Assignee: Individual
•
Filing: 1964-02-19
•
Granted: 1966-03-08
•
Expires: 1984-02-19
Abstract
No abstract record available.
Inventors
- 👤 Ryffel Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:20
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A HELICAL PUMP COMPRISING AT LEAST ONE ROTATABLE WORM AND AT LEAST ONE ROTATABLE HOLLOW NUT, SAID ROTATABLE WORM BEING LOCATED INTERNALLY OF SAID ROTATABLE HOLLOW NUT, THE AXIS OF ROTATION OF SAID NUT BEING ECCENTRIC WITH REPECT TO THE AXIS OF ROTATION OF SAID WORM, MEANS FOR COUPLING TOGETHER SAID WORM AND SAID NUT, AT LEAST ONE THREAD FACE OF SAID WORM AND SAID NUT BEING PROFILED IN SUCH A MANNER AS TO PROVIDE ALONG THE ENTIRE LENGTH OF SAID WORM AND SAID NUT TWO CONTINUOUS HELICAL LINES OF CONTACT, WITH THE REMAINING FACES OF EACH THREAD PITCH FORMING TWO CLOSED AND CRESCENT-SHAPED PUMPING CAVITIES.
Claim 2
Dependent Claim
106 words
A HELICAL PUMP COMPRISING AT LEAST ONE ROTATABLE WORM AND AT LEAST ONE ROTATABLE HOLLOW NUT, SAID ROTATABLE WORM BEING LOCATED INTERNALLY OF SAID ROTATABLE HOLLOW NUT, THE AXIS OF ROTATION OF SAID NUT BEING ECCENTRIC WITH REPECT TO THE AXIS OF ROTATION OF SAID WORM, MEANS FOR COUPLING TOGETHER SAID WORM AND SAID NUT, AT LEAST ONE THREAD FACE OF SAID WORM AND SAID NUT BEING PROFILED IN SUCH A MANNER AS TO PROVIDE ALONG THE ENTIRE LENGTH OF SAID WORM AND SAID NUT TWO CONTINUOUS HELICAL LINES OF CONTACT, WITH THE REMAINING FACES OF EACH THREAD PITCH FORMING TWO CLOSED AND CRESCENT-SHAPED PUMPING CAVITIES.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |