Patent US3138638A successfully refreshed from Google Patents.
US3138638A
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US
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Polymeric diphenyl phosphonitrile manufacture
Assignee: Armstrong World Industries Inc
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Filing: 1962-01-08
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Granted: 1964-06-23
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Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Irving I Bezman
- 👤 Charles T Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:57
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6581; C07F9/65812; C07F9/65814
Claims Analysis
Total Claims: 0
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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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |