Patent US3810850A successfully refreshed from Google Patents.
US3810850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piperazine phosphates as fire retardants for organic polymers
Assignee: Texaco Inc
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Filing: 1973-01-08
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Granted: 1974-05-14
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Expires: 1993-01-08
Abstract
Abstract PIPERAZINE PHOSPHATES OF THE FORMULA 2,3,5,6-TETRA(R-)PIPERAZINE . (H3PO4)X . (H2O)Y WHEREIN X IS 1 OR 2, Y IS 0 OR 1 AND EACH R, TAKEN INDIVIDUALLY, IS HYDROGEN OR LOWER ALKYL, AND PIPERAZINE PYROPHOSPHATE ACT AS FIRE RETARDANTS FOR ORGANIC POLYMERS.
Inventors
- 👤 R Rowton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/027; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C08K5/49; C08K5/51; C08K5/52; C08K5/5205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |