US3171189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cylindrical bearing surfaces
Assignee: Laystall Engineering Co Ltd
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Filing: 1962-10-26
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Granted: 1965-03-02
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Expires: 1982-10-26
Abstract
No abstract record available.
Inventors
- 👤 Hedgecock Vivien Janet
- 👤 Hedgecock John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:45
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/14; F16C2220/00; F16C2220/60; F16C2220/70; F16C2220/80; F16C2220/82; F16C2223/00; F16C2223/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49647; Y10T29/49668; Y10T29/49671; Y10T29/49673; Y10T29/49675; Y10T29/49702; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD OF FORMING AN OIL RETAINING SURFACE ON A BORE WALL OF A CYLINDER, WHICH METHOD CONSISTS IN FIRSTLY REMOVING METAL FROM SAID BORE WALL UNTIL SAID CYLINDER IS OF DESIRED INTERNAL DIAMETER AND HAS A SMOOTH SURFACE, APPLYING TO SAID BORE WALL A SLURRY OF AN ABRASIVE GRIT POWDER OF PREDETERMINED PARTICULATE SIZE, SAID SLURRY BEING PRESSED INTO CONTACT WITH SAID BORE WALL BY SPRING-URGED BLADES TRAVERSING SAID CYLINDER ON A HELICAL PATH, THE AXIS OF SAID HELICAL PATH COINCIDING WITH THE AXIS OF SAID CYLINDER, TO THEREBY PRODUCE, IN SAID BORE WALL, A MULTIPLICITY OF CLOSELY SPACED HELICAL GROOVES SUBSTANTIALLY PARALLEL TO ONE ANOTHER, AND SUBSEQUENTLY TRAVERSING THE BLADES IN SAID CYLINDER WITH THE ABRASIVE PARTICLES NATURALLY TENDING TO ENTER THE PREVIOUSLY STARTED HELICAL GROOVES AND BEING FREE TO FOLLOW SAID GROOVES, WHEREBY SUBSTANTIALLY NO ADDITIONAL GROOVES ARE STARTED.
Claim 2
Independent Claim
142 words
A METHOD OF FORMING AN OIL RETAINING SURFACE ON A BORE WALL OF A CYLINDER, WHICH METHOD CONSISTS IN FIRSTLY REMOVING METAL FROM SAID BORE WALL UNTIL SAID CYLINDER IS OF DESIRED INTERNAL DIAMETER AND HAS A SMOOTH SURFACE, APPLYING TO SAID BORE WALL A SLURRY OF AN ABRASIVE GRIT POWDER OF PREDETERMINED PARTICULATE SIZE, SAID SLURRY BEING PRESSED INTO CONTACT WITH SAID BORE WALL BY SPRING-URGED BLADES TRAVERSING SAID CYLINDER ON A HELICAL PATH, THE AXIS OF SAID HELICAL PATH COINCIDING WITH THE AXIS OF SAID CYLINDER, TO THEREBY PRODUCE, IN SAID BORE WALL, A MULTIPLICITY OF CLOSELY SPACED HELICAL GROOVES SUBSTANTIALLY PARALLEL TO ONE ANOTHER, AND SUBSEQUENTLY TRAVERSING THE BLADES IN SAID CYLINDER WITH THE ABRASIVE PARTICLES NATURALLY TENDING TO ENTER THE PREVIOUSLY STARTED HELICAL GROOVES AND BEING FREE TO FOLLOW SAID GROOVES, WHEREBY SUBSTANTIALLY NO ADDITIONAL GROOVES ARE STARTED.
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |