US3008799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cyclic phosphonitrilic chloride polymers
Assignee: Albright and Wilson Mfg Ltd
•
Filing: 1958-12-04
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Granted: 1961-11-14
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Expires: 1978-12-04
Abstract
No abstract record available.
Inventors
- 👤 Paddock Norman Lovelace
- 👤 Searle Harold Trevor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B21/098; C01B21/0986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR PREPARATION OF A SUBSTANTIALLY PURE CYCLIC PHOSPHONITRILIC CHLORIDE POLYMER, OF FORMULA (PNCL2)N WHEREIN N IS AN INTEGER OF FROM THREE TO SEVEN INCLUSIVE, WHICH COMPRISES DIFFERENTIALLY PARTITIONING A MIXTURE OF SUCH POLYMERS BETWEEN AN INERT ORGANIC SOLVENT AND A STRONG MINERAL ACID.
Claim 2
Dependent Claim
45 words
A PROCESS FOR PREPARATION OF A SUBSTANTIALLY PURE CYCLIC PHOSPHONITRILIC CHLORIDE POLYMER, OF FORMULA (PNCL2)N WHEREIN N IS AN INTEGER OF FROM THREE TO SEVEN INCLUSIVE, WHICH COMPRISES DIFFERENTIALLY PARTITIONING A MIXTURE OF SUCH POLYMERS BETWEEN AN INERT ORGANIC SOLVENT AND A STRONG MINERAL ACID.
References Cited (Backward Citations)
US2757081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |