Patent US2544858A successfully refreshed from Google Patents.
US2544858A
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Reaction products of esters of polyphosphoric acids and heavy metal oxides and method of making same
Assignee: Virginia Polytechnic Institute and State University
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Filing: 1949-06-09
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Granted: 1951-03-13
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Expires: 1969-06-09
Abstract
No abstract record available.
Inventors
- 👤 Hurt Robert Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:09
CPC Classifications
A; A01; A01N; A01N57/00; A01N57/10; A01N57/12; C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/098
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
THE HEAVY METAL POLYALKYL REACTION PRODUCT OF AN ESTER OF POLYPHOSPHORIC ACID AND AN OXIDE OF A HEAVY METAL.
Claim 2
Dependent Claim
19 words
THE HEAVY METAL POLYALKYL REACTION PRODUCT OF AN ESTER OF POLYPHOSPHORIC ACID AND AN OXIDE OF A HEAVY METAL.
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) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |