Patent US3172887A successfully refreshed from Google Patents.
US3172887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of melamine
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:39
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/62; C07D251/56; C07D251/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS OF PURIFYING RAW MELAMINE WHICH COMPRISES PREPARING SATURATED AQUEOUS SOLUTIONS OF MELAMINE AT TEMPERATURES IN THE RANGE BETWEEN 50* AND 95*C., PERCOLATING SAID SOLUTION THROUGH AN ION EXCHANGE COLUMN FILLED WITH A STRONGLY BASIC ANIONIC EXCHANGE RESIN KEPT AT THE TEMPERATURE RANGE AT WHICH THE MELAMINE SOLUTION WAS PREPARED, AND RECOVERING THE EFFLUENT SOLUTION OF PURIFIED MELAMINE.
Claim 2
Dependent Claim
59 words
A PROCESS OF PURIFYING RAW MELAMINE WHICH COMPRISES PREPARING SATURATED AQUEOUS SOLUTIONS OF MELAMINE AT TEMPERATURES IN THE RANGE BETWEEN 50* AND 95*C., PERCOLATING SAID SOLUTION THROUGH AN ION EXCHANGE COLUMN FILLED WITH A STRONGLY BASIC ANIONIC EXCHANGE RESIN KEPT AT THE TEMPERATURE RANGE AT WHICH THE MELAMINE SOLUTION WAS PREPARED, AND RECOVERING THE EFFLUENT SOLUTION OF PURIFIED MELAMINE.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |