US2720446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free-flowing ammonium nitrate
Assignee: Imperial Chemical Industries Ltd
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Filing: 1951-09-10
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Granted: 1955-10-11
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Expires: 1971-09-10
Abstract
No abstract record available.
Inventors
- 👤 Whetstone John
- 👤 Niall A R Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:49
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/30; C; C01; C01C; C01C1/00; C01C1/18; C05; C05C; C05C1/00; C05C1/02; C06; C06B; C06B31/00; C06B31/28; C06B31/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A FREE FLOWING AMMONIUM NITRATE COMPRISING CRYSTALS OF AMMONIUM NITRATE CONTAINING PER 100 PARTS OF AMMONIUM NITRATE, FROM 0.0001 TO 1.0 PART OF AT LEAST ONE SULPHONATED AROMATIC DYESTUFF PREDOMINANTLY DISTRIBUTED ON THE SURFACE OF SAID CRYSTALS WHICH IS SOLUBLE TO THE EXTENT OF AT LEAST 0.01% IN A SATURATED AQUEOUS AMMONIUM NITRATE SOLUTION AT 20* C. AND WHICH IN SOLUTION IN A SATURATED AQUEOUS SOLUTION TO PRODUCE ON CRYSTALLIZATION IN THE TEMPERATURE RANGE IN WHICH THE STABLE FORM OF AMMONIUM NITRATE IS AMMONIUM NITRATE IV, CRYSTALS OF AMMONIUM NITRATE IV AS (010) PRIMS, LATHS, PLATES OR SCALES, TO THEREBY LOWER THE TENDENCY OF AMMONIUM NITRATE TO SET AT TEMPERATURES BELOW 32* C., AND ALSO CONTAINING ON THE SURFACE OF SAID CRYSTALS A SMALL QUANTITY OF A SURFACE ACTIVE COMPOUND SOLUBLE IN A SATURATED SOLUTION OF AMMONIUM NITRATE AND HAVING THE PROPERTY OF REDUCING THE SURFACE TENSION AT 20* C. OF A SATURATED AMMONIUM NITRATE SOLUTION FROM 85 DYNES PER CM. TO A VALUE NOT EXCEEDING 50 DYNES PER CM. TO THEREBY LOWER IN THE PRESENCE OF SAID DYESTUFF THE TENDENCY OF AMMONIUM NITRATE TO SET AT TEMPERATURES ABOVE 32* C., AND TO INCREASE THE EFFECT OF SAID DYESTUFF BELOW 32* C.
Claim 2
Dependent Claim
202 words
A FREE FLOWING AMMONIUM NITRATE COMPRISING CRYSTALS OF AMMONIUM NITRATE CONTAINING PER 100 PARTS OF AMMONIUM NITRATE, FROM 0.0001 TO 1.0 PART OF AT LEAST ONE SULPHONATED AROMATIC DYESTUFF PREDOMINANTLY DISTRIBUTED ON THE SURFACE OF SAID CRYSTALS WHICH IS SOLUBLE TO THE EXTENT OF AT LEAST 0.01% IN A SATURATED AQUEOUS AMMONIUM NITRATE SOLUTION AT 20* C. AND WHICH IN SOLUTION IN A SATURATED AQUEOUS SOLUTION TO PRODUCE ON CRYSTALLIZATION IN THE TEMPERATURE RANGE IN WHICH THE STABLE FORM OF AMMONIUM NITRATE IS AMMONIUM NITRATE IV, CRYSTALS OF AMMONIUM NITRATE IV AS (010) PRIMS, LATHS, PLATES OR SCALES, TO THEREBY LOWER THE TENDENCY OF AMMONIUM NITRATE TO SET AT TEMPERATURES BELOW 32* C., AND ALSO CONTAINING ON THE SURFACE OF SAID CRYSTALS A SMALL QUANTITY OF A SURFACE ACTIVE COMPOUND SOLUBLE IN A SATURATED SOLUTION OF AMMONIUM NITRATE AND HAVING THE PROPERTY OF REDUCING THE SURFACE TENSION AT 20* C. OF A SATURATED AMMONIUM NITRATE SOLUTION FROM 85 DYNES PER CM. TO A VALUE NOT EXCEEDING 50 DYNES PER CM. TO THEREBY LOWER IN THE PRESENCE OF SAID DYESTUFF THE TENDENCY OF AMMONIUM NITRATE TO SET AT TEMPERATURES ABOVE 32* C., AND TO INCREASE THE EFFECT OF SAID DYESTUFF BELOW 32* C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |