US3284144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearings
Assignee: American Lava Corp
•
Filing: 1964-06-08
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Granted: 1966-11-08
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Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Charles W Moore
- 👤 Iii Reginald L Brandon
- 👤 James P Smyly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:06
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1677; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/043; F16C33/06; F16C33/10; F16C33/1005; F16C33/12; F16C33/122; F16C17/00; F16C17/10; F16C17/102; F16C17/107; F16C2206/00; F16C2206/40; F16C2206/42; F16C2206/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A WEAR-RESISTANT ESSENTIALLY-FRICTIONLESS BEARING CONSISTING ESSENTIALLY TO TWO BODIES WHICH PRESENT SMOOTH BEARING SURFACES TO EACH OTHER, SAID BODIES BEING CERAMIC BODIES OF A COMPOSITION CONSISTING ESSENTIALLY OF 91 TO 98% BY WEIGHT OF ALPHA ALUMINA CRYSTALS, AND AT LEAST 2% UP TO 6% BY WEIGHT OF A REFRACTORY GLASSY MATRIX, SAID CRYSTALS OF ALUMINA BEING NO GREATER THAN 150 MICRONS IN ANY DIMENSION, WITH 98% OF THE SAME LYING IN THE RANGE OF 0.5 TO 40 MICRONS, THE MATERIAL OF SAID BODIES BEING HIGHLY COMPACTED SUCH THAT THE DENSITY FOR SAID BODIES IS AT LEAST 98% OF THEORETICAL, WITH NO VOIDS GREATER THAN 0.01 INCH IN CROSS SECTION IN SAID BODIES; THE BEARING SURFACES OF SAID BODIES BEING PROVIDED WITH A SURFACE FINISH, AS DESCRIBED HEREIN, NO GREATER THAN 20 R.M.S. MICROINCHES.
Claim 2
Dependent Claim
133 words
A WEAR-RESISTANT ESSENTIALLY-FRICTIONLESS BEARING CONSISTING ESSENTIALLY TO TWO BODIES WHICH PRESENT SMOOTH BEARING SURFACES TO EACH OTHER, SAID BODIES BEING CERAMIC BODIES OF A COMPOSITION CONSISTING ESSENTIALLY OF 91 TO 98% BY WEIGHT OF ALPHA ALUMINA CRYSTALS, AND AT LEAST 2% UP TO 6% BY WEIGHT OF A REFRACTORY GLASSY MATRIX, SAID CRYSTALS OF ALUMINA BEING NO GREATER THAN 150 MICRONS IN ANY DIMENSION, WITH 98% OF THE SAME LYING IN THE RANGE OF 0.5 TO 40 MICRONS, THE MATERIAL OF SAID BODIES BEING HIGHLY COMPACTED SUCH THAT THE DENSITY FOR SAID BODIES IS AT LEAST 98% OF THEORETICAL, WITH NO VOIDS GREATER THAN 0.01 INCH IN CROSS SECTION IN SAID BODIES; THE BEARING SURFACES OF SAID BODIES BEING PROVIDED WITH A SURFACE FINISH, AS DESCRIBED HEREIN, NO GREATER THAN 20 R.M.S. MICROINCHES.
References Cited (Backward Citations)
US2696413A
Cited
US3037828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |