US3843552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for oxidation of o-xylene
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1971-08-24
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Granted: 1974-10-22
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Expires: 1991-08-24
Abstract
Abstract 1. A CATALYST FOR THE PREPARATION OF PHTHALIC ANHYDRIDE BY OXIDATION OF ORTHO-XYLENE IN THE GASEOUS PHASE COMPRISING A SUPPORT IMPREGNATED WITH A SILICATE ENAMETL AND A COATING OF CATALYTICALLY ACTIVE MATERIAL ON THE ENAMELLED SUPPORT.
Inventors
- 👤 M Jouy
- 👤 M Coblentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:11
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A CATALYST FOR THE PREPARATION OF PHTHALIC ANHYDRIDE BY OXIDATION OF ORTHO-XYLENE IN THE GASEOUS PHASE COMPRISING A SUPPORT IMPREGNATED WITH A SILICATE ENAMETL AND A COATING OF CATALYTICALLY ACTIVE MATERIAL ON THE ENAMELLED SUPPORT.
Claim 2
Dependent Claim
35 words
A CATALYST FOR THE PREPARATION OF PHTHALIC ANHYDRIDE BY OXIDATION OF ORTHO-XYLENE IN THE GASEOUS PHASE COMPRISING A SUPPORT IMPREGNATED WITH A SILICATE ENAMETL AND A COATING OF CATALYTICALLY ACTIVE MATERIAL ON THE ENAMELLED SUPPORT.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |