US2872283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polymeric phosphonitrilic chloride
Assignee: Individual
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Filing: 1956-01-13
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Granted: 1959-02-03
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Expires: 1976-01-13
Abstract
No abstract record available.
Inventors
- 👤 Maurice C Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:04
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR THE MANUFACTURE OF PHOSPHONITRILIC CHLORIDE POLYMERIZED TO A MODERATE DEGREE WHICH COMPRISES HEATING A MIXTURE OF POLYMERS OF PHOSPHONITRILIC CHLORIDE ABOVE 200*C, AT A PRESSURE IN EXCESS OF THE VAPOR PRESSURE OF THE TRIMER OF PHOSPHONITRILIC CHLORIDE AT THE TEMPERATURE OF OPERATION UNTIL A HIGHLY POLYMERIZED PRODUCT IS PRODUCED, THEREAFTER HEATING THE HIGHLY POLYMERIZED PRODUCT AT A TEMPERATURE ABOVE 300* C. AND AT A PRESSURE LESS THAN THE VAPOR PRESSURE AT THE TEMPERATURE OF THIS OPERATION OF THE LOWER MOLECULAR WEIGHT POLYMERS BEING FORMED UNTIL THE HIGHLY POLYMERIZED PRODUCT IS DEPOLYMERIZED AND THEN FRACTIONATING THE DEPOLYMERIZED PRODUCT BY DISTILLATION AND SEPARATING THE DESIRED POLYMERS POLYMERIZED TO A MODERATE DEGREE, MIXING THE UNDESIRED LOWER POLYMERS AND THE STILL RESIDUE FOR A REPETITION OF POLYMERIZATION, DEPOLYMERIZATION AND FRACTIONATION DESTILLATION AS DESCRIBED.
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE MANUFACTURE OF PHOSPHONITRILIC CHLORIDE POLYMERIZED TO A MODERATE DEGREE WHICH COMPRISES HEATING A MIXTURE OF POLYMERS OF PHOSPHONITRILIC CHLORIDE ABOVE 200*C, AT A PRESSURE IN EXCESS OF THE VAPOR PRESSURE OF THE TRIMER OF PHOSPHONITRILIC CHLORIDE AT THE TEMPERATURE OF OPERATION UNTIL A HIGHLY POLYMERIZED PRODUCT IS PRODUCED, THEREAFTER HEATING THE HIGHLY POLYMERIZED PRODUCT AT A TEMPERATURE ABOVE 300* C. AND AT A PRESSURE LESS THAN THE VAPOR PRESSURE AT THE TEMPERATURE OF THIS OPERATION OF THE LOWER MOLECULAR WEIGHT POLYMERS BEING FORMED UNTIL THE HIGHLY POLYMERIZED PRODUCT IS DEPOLYMERIZED AND THEN FRACTIONATING THE DEPOLYMERIZED PRODUCT BY DISTILLATION AND SEPARATING THE DESIRED POLYMERS POLYMERIZED TO A MODERATE DEGREE, MIXING THE UNDESIRED LOWER POLYMERS AND THE STILL RESIDUE FOR A REPETITION OF POLYMERIZATION, DEPOLYMERIZATION AND FRACTIONATION DESTILLATION AS DESCRIBED.
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) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |