US3328115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for catalytically purifying gases containing oxides of nitrogen
Assignee: Engelhard Industries Inc
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Filing: 1965-09-23
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Granted: 1967-06-27
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Expires: 1985-09-23
Abstract
No abstract record available.
Inventors
- 👤 Carl D Keith
- 👤 Paula M Kenah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:36
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J21/00; B01J21/02; B01J21/04; B01J21/16; B01J37/00; B01J37/02; B01J37/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE SELECTIVE REMOVAL OF OXIDES OF NITROGEN FROM NITRIC ACID PLANT TAIL GASES, WHICH COMPRISES CONTACTING AN ADMIXTURE OF THE TAIL GASES AND AMMONIA AT REACTION TEMPERATURE WITH A PLATINUM GROUP METAL-CONTAINING CATALYST WITH THE PLATINUM GROUP METAL IN THE FORM OF CRYSTALLITES HAVING SIZE WITHIN THE RANGE OF ABOUT 500-900 ANGSTROM UNITS AS DETERMINED BY X-RAY DIFFRACTION MEASUREMENTS.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE SELECTIVE REMOVAL OF OXIDES OF NITROGEN FROM NITRIC ACID PLANT TAIL GASES, WHICH COMPRISES CONTACTING AN ADMIXTURE OF THE TAIL GASES AND AMMONIA AT REACTION TEMPERATURE WITH A PLATINUM GROUP METAL-CONTAINING CATALYST WITH THE PLATINUM GROUP METAL IN THE FORM OF CRYSTALLITES HAVING SIZE WITHIN THE RANGE OF ABOUT 500-900 ANGSTROM UNITS AS DETERMINED BY X-RAY DIFFRACTION MEASUREMENTS.
References Cited (Backward Citations)
US2975025A
Cited
US3094493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |