US3098871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cyclic phosphonitriles
Assignee: Armstrong World Industries Inc
•
Filing: 1961-06-16
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Granted: 1963-07-23
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Expires: 1981-06-16
Abstract
No abstract record available.
Inventors
- 👤 Irving I Bezman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:29
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6581; C07F9/65812; C07F9/65814
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
IN A METHOD OF FORMING A MIXTURE OF CYCLIC PHOSPHONITRILES OF THE FORMULA (RR''PN)M WHERE M IN THE MIXTURE IS PREDOMINANTLY 3 AND 4 AND WHERE R AND R'' ARE MEMBERS SELECTED FROM THE CLASS CONSISTING OF A PHENYL AND A SUBSTITUTED PHENYL OF THE FORMULA
Claim 2
Dependent Claim
46 words
IN A METHOD OF FORMING A MIXTURE OF CYCLIC PHOSPHONITRILES OF THE FORMULA (RR''PN)M WHERE M IN THE MIXTURE IS PREDOMINANTLY 3 AND 4 AND WHERE R AND R'' ARE MEMBERS SELECTED FROM THE CLASS CONSISTING OF A PHENYL AND A SUBSTITUTED PHENYL OF THE FORMULA
References Cited (Backward Citations)
US2853517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |