Patent US3209611A successfully refreshed from Google Patents.
US3209611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teeth profiles of rotors for gear pumps of rotary type
Assignee: Individual
•
Filing: 1961-05-02
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Granted: 1965-10-05
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Expires: 1981-05-02
Abstract
No abstract record available.
Inventors
- 👤 Iyoi Hitosi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:50
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/084; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A GEAR PUMP, FIRST AND SECOND INTERMESHING HELICAL TOOTHED GEARS JOURNALED FOR ROTATION ON RESPECTIVE FIRST AND SECOND SPACED PARALLEL AXES, EACH HELICAL TOOTH OF SAID GEARS HAVING AN ADVANCE EQUAL TO THE PITCH AND A CONTINUITY PROVIDING A CONTINUOUS DRIVING ACTION BETWEEN THE ENGAGING TEETH, THE PROFILE OF EACH TOOTH BEING ALLOCHIRALLY SYMMETRICAL WITH RESPECT TO AND BETWEEN A FIRST RADIAL LINE CENTRALLY THROUGH THE TIP THEREOF AND TO A SECOND RADIAL LINE MAKING ONE-HALF THE PITCH ANGLE WITH SAID FIRST RADIAL LINE AND INTERSECTING SAID PROFILE AT FIRST AND SECOND POINTS, THE PROFILE BETWEEN SAID POINTS COMPRISING THE ARC OF AN ELLIPSE HAVING ITS MAJOR AXIS ON SAID FIRST RADIAL LINE AND BELOW THE PITCH LINE.
Claim 2
Dependent Claim
119 words
IN A GEAR PUMP, FIRST AND SECOND INTERMESHING HELICAL TOOTHED GEARS JOURNALED FOR ROTATION ON RESPECTIVE FIRST AND SECOND SPACED PARALLEL AXES, EACH HELICAL TOOTH OF SAID GEARS HAVING AN ADVANCE EQUAL TO THE PITCH AND A CONTINUITY PROVIDING A CONTINUOUS DRIVING ACTION BETWEEN THE ENGAGING TEETH, THE PROFILE OF EACH TOOTH BEING ALLOCHIRALLY SYMMETRICAL WITH RESPECT TO AND BETWEEN A FIRST RADIAL LINE CENTRALLY THROUGH THE TIP THEREOF AND TO A SECOND RADIAL LINE MAKING ONE-HALF THE PITCH ANGLE WITH SAID FIRST RADIAL LINE AND INTERSECTING SAID PROFILE AT FIRST AND SECOND POINTS, THE PROFILE BETWEEN SAID POINTS COMPRISING THE ARC OF AN ELLIPSE HAVING ITS MAJOR AXIS ON SAID FIRST RADIAL LINE AND BELOW THE PITCH LINE.
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |