US3189989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion hardening of lead
Assignee: Associated Electrical Industries Ltd
•
Filing: 1963-05-20
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Granted: 1965-06-22
•
Expires: 1983-05-20
Abstract
No abstract record available.
Inventors
- 👤 Ebdon Denis Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:27
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A METHOD OF PRODUCING STRENGTHENED LEAD WHICH COMPRISES EXTRUDING LEAD OXIDE COATED LEAD PARTICLES THROUGH A DIE AND THEN ROLLING THE EXTRUDED LEAD ALONG AND ACROSS THE DIRECTION OF EXTRUSION.
Claim 2
Independent Claim
30 words
A METHOD OF PRODUCING STRENGTHENED LEAD WHICH COMPRISES EXTRUDING LEAD OXIDE COATED LEAD PARTICLES THROUGH A DIE AND THEN ROLLING THE EXTRUDED LEAD ALONG AND ACROSS THE DIRECTION OF EXTRUSION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |