US3799886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for the manufacture of phthalic anhydride
Assignee: Wacker Chemie AG
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Filing: 1972-01-24
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Granted: 1974-03-26
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Expires: 1992-01-24
Abstract
Abstract A CATALYST FOR USE IN MANUFACTURING PHTHALIC ANHYDRIDE CONSISTING OF A CARRIER COATED EITH A COATING OF VANADIUM PENTOXIDE AND TITANIUM DOIXIDE, WHICH AFTER A 5-HOUR TEMPERING PERIOD AT 400* C. HAS A BET SURFACE OF 15100 SQ. M.*G.
Inventors
- 👤 K Felice
- 👤 J Sedlmeier
- 👤 O Wiedemann
- 👤 W Gierer
- 👤 W Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:39
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J37/0221; B01J37/0223; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J37/0009; B01J37/0018; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |