Patent US4668887A successfully refreshed from Google Patents.
Patent US2520090A successfully refreshed from Google Patents.
US2520090A
Expired / Lapsed
US
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Polyphosphates of divalent aryl hydrocarbons
Assignee: Monsanto Chemicals Ltd
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Filing: 1947-12-30
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Granted: 1950-08-22
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Expires: 1967-12-30
Abstract
No abstract record available.
Inventors
- 👤 Gerald R Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:04
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A PLASTICIZING AGENT CONSISTING OF A POLYPHOSPHATE COMPOUND OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
13 words
A PLASTICIZING AGENT CONSISTING OF A POLYPHOSPHATE COMPOUND OF THE FOLLOWING GENERAL FORMULA:
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) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |