US3629377A
Expired / Lapsed
US
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Process for preparing phosphate ester surface active agents in the presence of a bis(hydroxymethyl) phosphinic acid color inhibitor
Assignee: GAF Corp
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Filing: 1969-02-20
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Granted: 1971-12-21
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Expires: 1989-02-20
Abstract
Abstract AN IMPROVED PROCESS FOR PRODUCING PHOSPHATE ESTER SURFACE ACTIVE AGENTS BY THE REACTION OF P2O5 AND AN ORGANIC HYDROXYL-CONTAINING COMPOUND, THE IMPROVEMENTS RELATING TO CONDUCTING SUCH REACTION IN THE PRESENCE OF A COLOR INHIBITOR COMPRISING BIS(HYDROXYMETHYL) PHOSPHINIC ACID.
Inventors
- 👤 Leslie M Schenck
- 👤 Leslie G Nunn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:40
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |