Patent US6289094B1 successfully refreshed from Google Patents.
US3667922A
Expired / Lapsed
US
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Production of cyclic phosphonitrilic chloride polymers
Assignee: Occidental Chemical Corp
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Filing: 1969-09-15
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Granted: 1972-06-06
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Expires: 1989-09-15
Abstract
Abstract IN THE PRODUCTION OF PHOSPHONITRILLIC CHLORIDES BY THE REACTION OF PHOSPHORUS PENTACHLORIDE AND AMMONIUM CHLORIDE IN AN INERT SOLVENT THE PROPORTION OF TRIMERIC PHOLSPHONITRILLIC CHLORIDE IS GREATLY INCREASED BY ADDDING AT LEAST A MAJOR PROPORTION OF THE PHOSPHORUS PENTACHLORIDE TO THE AMMONIUM CHLORIDE SLOWLY AND EVENLY DURING A PERIOD OF TIME CORRESPONDING TO ABOUT 50 TO ABOUT 100 PERCENT OF THE TOTAL TIME DURING WHICH THE REACTION TAKES PLACE.
Inventors
- 👤 James Ernest Proctor
- 👤 Norman Lovelace Paddock
- 👤 Harold Trevor Searle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:48
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |