US3142892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metal powder compacts
Assignee: Individual
•
Filing: 1961-06-13
•
Granted: 1964-08-04
•
Expires: 1981-06-13
Abstract
No abstract record available.
Inventors
- 👤 Robert A Powell
- 👤 Frank I Zaleski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:43
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
53 words
IN A PROCESS FOR PRODUCING A COMPACT OF METAL POWDER CONSISTING ESSENTIALLY OF ABOUT 70% COPPER AND 30% ZINC COMPRISING MIXING SAID POWDER WITH A LUBRICANT, COMPRESSING SAID MIXED POWDER AND SINTERING SAID COMPRESSED POWDER IN A NITROGEN ATMOSPHERE, THE IMPROVEMENT WHICH CONSISTS IN THE STEP OF EMPLOYING LITHIUM STEARATE AS SAID LUBRICANT.
Claim 2
Dependent Claim
53 words
IN A PROCESS FOR PRODUCING A COMPACT OF METAL POWDER CONSISTING ESSENTIALLY OF ABOUT 70% COPPER AND 30% ZINC COMPRISING MIXING SAID POWDER WITH A LUBRICANT, COMPRESSING SAID MIXED POWDER AND SINTERING SAID COMPRESSED POWDER IN A NITROGEN ATMOSPHERE, THE IMPROVEMENT WHICH CONSISTS IN THE STEP OF EMPLOYING LITHIUM STEARATE AS SAID LUBRICANT.
Claim 3
Dependent Claim
52 words
A SINGLE-SINTERED, PREALLOYED 70-30 BRASS POWDER COMPACT PRODUCED ACCORDING TO THE PROCESS OF CLAIM 1, SAID COMPACT BEING CHARACTERIZED BY A TENSILE STRENGTH RANGING BETWEEN 38,500 AND 42,000 P.S.I., A TENSILE ELONGATION IN 1 INCH RANGING BETWEEN 30 AND 42% AND A DENSITY RANGING BETWEEN 7.99 AND 8.17 GRAMS PER CUBIC CENTIMETER.
References Cited (Backward Citations)
US2546320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |