US3034735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead filled ceramic media for grinding
Assignee: —
•
Filing: —
•
Granted: 1962-05-15
•
Expires: 1979-05-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:17
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/06; B22D25/00; B22D25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A CORROSION RESISTANT GRINDING MEDIUM FOR USE IN TUMBLING MILLS CONSISTING ESSENTIALLY OF AN OUTER WEARING SURFACE SHELL OF A HARD CERAMIC MATERIAL, SAID SHELL HAVING A PLURALITY OF ADJACENT OPENINGS THERETHROUGH, AND A LEAD CORE ENTIRELY FILLING SAID SHELL AND SAID OPENINGS; THE VOLUME OF SAID CORE AND OF SAID SHELL BEING SO PROPORTIONED AS TO OBTAINED A PREDETERMINED AVERAGE SPECIFIC GRAVITY.
Claim 2
Dependent Claim
63 words
A CORROSION RESISTANT GRINDING MEDIUM FOR USE IN TUMBLING MILLS CONSISTING ESSENTIALLY OF AN OUTER WEARING SURFACE SHELL OF A HARD CERAMIC MATERIAL, SAID SHELL HAVING A PLURALITY OF ADJACENT OPENINGS THERETHROUGH, AND A LEAD CORE ENTIRELY FILLING SAID SHELL AND SAID OPENINGS; THE VOLUME OF SAID CORE AND OF SAID SHELL BEING SO PROPORTIONED AS TO OBTAINED A PREDETERMINED AVERAGE SPECIFIC GRAVITY.
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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) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |