Patent US2882589A successfully refreshed from Google Patents.
US2882589A
Expired / Lapsed
US
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Lubricant in powder metallurgy
Assignee: Wyeth Holdings LLC
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Filing: 1954-05-10
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Granted: 1959-04-21
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Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 Robert W Stafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:54
CPC Classifications
C; C10; C10M; C10M7/00; B; B22; B22F; B22F1/00; B22F1/10; C10M2201/00; C10M2201/04; C10M2201/05; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/129; C10N; C10N2010/00; C10N2050/00; C10N2050/08; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A MOLDING COMPOSITION CONSISTING ESSENTIALLY OF POWDERED METAL AND FROM ABOUT 0.5% TO ABOUT 3.0% BY WEIGHT OF SAID METAL OF A ZINC STEARATE POWDER IN WHICH AT LEAST 50% BY WEIGHT OF THE ZINC STEARATE POWDER PARTICLES ARE IN THE SIZE RANGE OF ABOUT 0.10-0.60 MICRON, SAID ZINC STEARATE HAVING BEEN PREPARED FROM STEARIC ACID OF BETTER THAN ABOUT 90 PERCENT PURITY.
Claim 2
Dependent Claim
63 words
A MOLDING COMPOSITION CONSISTING ESSENTIALLY OF POWDERED METAL AND FROM ABOUT 0.5% TO ABOUT 3.0% BY WEIGHT OF SAID METAL OF A ZINC STEARATE POWDER IN WHICH AT LEAST 50% BY WEIGHT OF THE ZINC STEARATE POWDER PARTICLES ARE IN THE SIZE RANGE OF ABOUT 0.10-0.60 MICRON, SAID ZINC STEARATE HAVING BEEN PREPARED FROM STEARIC ACID OF BETTER THAN ABOUT 90 PERCENT PURITY.
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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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |