Patent US3981547A successfully refreshed from Google Patents.
US3981547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral, tapered-land, journal bearing
Assignee: Individual
•
Filing: 1975-07-15
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Granted: 1976-09-21
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Expires: 1995-07-15
Abstract
Abstract A journal bearing having circumferential grooves therein defining a spiral land. The leading edge of the land is indented either by being tapered or by having a Rayleigh step excised therefrom.
Inventors
- 👤 John E. Perruzzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:43
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/1085; F04; F04D; F04D3/00; F04D3/02; F16C17/00; F16C17/02; F16C17/026; F16C33/1065
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
A journal bearing comprising: a bearing; and a journal within said bearing, said journal being formed with a circumferential, spiral land having an indented leading section to form an oil wedge to support said journal within said bearing.
Claim 2
Dependent Claim
38 words
A journal bearing comprising: a bearing; and a journal within said bearing, said journal being formed with a circumferential, spiral land having an indented leading section to form an oil wedge to support said journal within said bearing.
Claim 3
Dependent Claim
19 words
A bearing as in claim 1, wherein the indentation in said leading section has the form of a ramp.
Claim 4
Dependent Claim
20 words
A bearing as in claim 1, wherein the indentation in said leading section has the form of a Rayleigh step.
Claim 5
Dependent Claim
80 words
A fluid pump comprising: a fluidtight cylindrical housing, having a hole for the insertion of the fluid being pumped, and another hole for the collection and removal of said fluid; and a cylindrical journal inside said housing, said journal being formed with a spiral, circumferential land having a trailing section with a slightly smaller diameter than the inside diameter of said housing and with an indented leading section to form an oil wedge to support said journal within said bearing.
Claim 6
Dependent Claim
80 words
A fluid pump comprising: a fluidtight cylindrical housing, having a hole for the insertion of the fluid being pumped, and another hole for the collection and removal of said fluid; and a cylindrical journal inside said housing, said journal being formed with a spiral, circumferential land having a trailing section with a slightly smaller diameter than the inside diameter of said housing and with an indented leading section to form an oil wedge to support said journal within said bearing.
Claim 7
Dependent Claim
19 words
A pump as in claim 4, wherein the indentation in said leading section has the form of a ramp.
Claim 8
Dependent Claim
20 words
A pump as in claim 4, wherein the indentation in said leading section has the form of a Rayleigh step.
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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |