US3635970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline melamine pyrophosphate
Assignee: Wyeth Holdings LLC
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Filing: 1969-04-17
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Granted: 1972-01-18
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Expires: 1989-04-17
Abstract
Abstract A NEW CRYSTALLINE FORM OF MELAMINE PYROPHOSPHATE HAVING ITS MAXIMUM INTENSITY AT A PEAK IN ITS X-RAY DIFFRACTION PATTERN OF 3.25 A. AND A PROCESS FOR MAKING IT WHEREIN A PYROPHOSPHATE SALT IS ADDED TO AN AQUEOUS SYSTEM OF MELAMINE AND A MINERAL ACID PRESENT IN AT LEAST TWICE THE STOICHIOMERIC AMOUNT OF MELAMINE ARE PROVIDED.
Inventors
- 👤 Robert Glenn Fessler
- 👤 Bruce Charles Tredinnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:57
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/18; C09D5/185; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/42
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |