US2866773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of inorganic polymeric substances
Assignee: Walker Extract and Chemical Co Ltd
•
Filing: 1955-07-11
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Granted: 1958-12-30
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Expires: 1975-07-11
Abstract
No abstract record available.
Inventors
- 👤 Redfarn Cyril Aubrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:16
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR THE PRODUCTION OF MODIFIED INORGANIC POLYMERIC SUBSTANCES WHICH COMPRISES HEATING A POLYPHOSPHONITRILIC CHLORIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS WITH A POLYHYDROXY AROMATIC COMPOUND, THE MOLAR RATIO OF SAID POLYPHOSPHONITRILIC CHLORIDE TO THE POLYHYDROXY AROMATIC COMPOUND BEING WITHIN THE RANGE OF FROM ABOUT 2:1 TO ABOUT 1:1.
Claim 2
Dependent Claim
48 words
A PROCESS FOR THE PRODUCTION OF MODIFIED INORGANIC POLYMERIC SUBSTANCES WHICH COMPRISES HEATING A POLYPHOSPHONITRILIC CHLORIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS WITH A POLYHYDROXY AROMATIC COMPOUND, THE MOLAR RATIO OF SAID POLYPHOSPHONITRILIC CHLORIDE TO THE POLYHYDROXY AROMATIC COMPOUND BEING WITHIN THE RANGE OF FROM ABOUT 2:1 TO ABOUT 1:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |