US3315342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion strengthening of lead
Assignee: St. Joseph's Hospital and Medical Center
•
Filing: 1963-03-29
•
Granted: 1967-04-25
•
Expires: 1983-03-29
Abstract
No abstract record available.
Inventors
- 👤 Roberts David Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:11
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/12; B; B21; B21C; B21C23/00; B21C23/01; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/059; C22C11/00; C22C32/00; C22C32/001; C22C32/0015; C22C32/0042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD FOR PRODUCING DISPERSION-STRENGTHENED LEAD FROM LEAD POWDER, WHICH COMPRISES SUBJECTING THE LEAD POWDER TO A MECHANICAL PROCESS WHEREBY THE OXIDE COATINGS ON THE LEAD PARTICLES ARE BROKEN UP AND THE RESULTANT OXIDE FRAGMENTS FORCED INTO THE LEAD PARTICLES THEMSELVES, WHILE FURTHER OXIDATION TAKES PLACE ON FRESH SURFACES, AND THEREAFTER EXTRUDING THE LEAD POWDER TO PRODUCE SOLID LEAD CONTAINING A DISPERSION OF OXIDE.
Claim 2
Independent Claim
64 words
A METHOD FOR PRODUCING DISPERSION-STRENGTHENED LEAD FROM LEAD POWDER, WHICH COMPRISES SUBJECTING THE LEAD POWDER TO A MECHANICAL PROCESS WHEREBY THE OXIDE COATINGS ON THE LEAD PARTICLES ARE BROKEN UP AND THE RESULTANT OXIDE FRAGMENTS FORCED INTO THE LEAD PARTICLES THEMSELVES, WHILE FURTHER OXIDATION TAKES PLACE ON FRESH SURFACES, AND THEREAFTER EXTRUDING THE LEAD POWDER TO PRODUCE SOLID LEAD CONTAINING A DISPERSION OF OXIDE.
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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |