US3171818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing phosphorus-containing polymers from diphosphonous acid esters and organic dihalogen compounds
Assignee: Armstrong World Industries Inc
•
Filing: 1961-09-06
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Granted: 1965-03-02
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Expires: 1981-09-06
Abstract
No abstract record available.
Inventors
- 👤 Sander Manfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:36
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/48; C07F9/4808; C07F9/485; C07F9/30; C07F9/32; C08; C08G; C08G79/00; C08G79/02; C08G79/04; C08G79/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
THE METHOD OF PRODUCING PHOSPHORUS-CONTAINING POLYCONDENSATES COMPRISING REACTING DIPHOSPHONITES OF THE GENERAL FORMULA
Claim 2
Independent Claim
13 words
THE METHOD OF PRODUCING PHOSPHORUS-CONTAINING POLYCONDENSATES COMPRISING REACTING DIPHOSPHONITES OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2957931A
Cited
US2728806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |