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US3663460A
Expired / Lapsed
US
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Chromium(iii) and iron(iii) hydroxy bis(phosphinate) and bis(arsinate) polymers
Assignee: Pennwalt Corp
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Filing: 1970-04-27
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Granted: 1972-05-16
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Expires: 1990-04-27
Abstract
Abstract CHROMIUM (III) AND IRON (III) HYDROXY BIS (PHOSPHINATE) AND BIS(ARSINATE) POLYMERS COMPOSED OF THE RECURRING UNIT (Z(OH)(OMRR''O)2), WHERE Z IS CHROMIUM OR IRON IN THE TRIVALENT STATE, M IS PHOSPHORUS OR ARSENIC, AND R AND R'' ARE INERT ORGANIC GROUPS, ARE USEFUL AS CORROSION PROOF COATINGS FOR METAL WHICH WILL BE SUBJECTED TO HIGH TEMPERATURE CONDITIONS.
Inventors
- 👤 Burton Peter Block
- 👤 Piero Luigi Nannelli
- 👤 Hyman David Gillman
- 👤 Paula Marion Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:07
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/14
Claims Analysis
Total Claims: 0
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |