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Patent US3353923A successfully refreshed from Google Patents.
US3353923A
Expired / Lapsed
US
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Catalytic reactor tube liner
Assignee: Reichhold Chemicals Inc
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Filing: 1963-05-24
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Granted: 1967-11-21
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Expires: 1983-05-24
Abstract
No abstract record available.
Inventors
- 👤 Peters Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/06; C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00212
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN AN APPARATUS FOR VAPOR PHASE CATALYTIC OXIDATION OF AN AROMATIC HYDROCARBON TO PRODUCE AN ORGANIC POLYBASIC ACID ANHYDRIDE, WHEREIN THE HYDROCARBON AND AN OXIDIZING GAS ARE PASSED TOGETHER THROUGH HEATED METAL TUBES CONTAINING THE CATALYST; THE IMPROVEMENT WHEREIN THE TUBING IS PROVIDED WITH AN INTERIOR SURFACE COMPRISING A CHELATE POLYMER.
Claim 2
Dependent Claim
51 words
IN AN APPARATUS FOR VAPOR PHASE CATALYTIC OXIDATION OF AN AROMATIC HYDROCARBON TO PRODUCE AN ORGANIC POLYBASIC ACID ANHYDRIDE, WHEREIN THE HYDROCARBON AND AN OXIDIZING GAS ARE PASSED TOGETHER THROUGH HEATED METAL TUBES CONTAINING THE CATALYST; THE IMPROVEMENT WHEREIN THE TUBING IS PROVIDED WITH AN INTERIOR SURFACE COMPRISING A CHELATE POLYMER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |