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US3520826A
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US
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Catalyst compositions and their preparation
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1967-02-14
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Granted: 1970-07-21
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Expires: 1987-02-14
Abstract
No abstract record available.
Inventors
- 👤 Kenjiro Tanaka
- 👤 Hideo Konuma
- 👤 Katsuhiro Ono
- 👤 Yoshinobu Tachibana
- 👤 Hiroshi Ichikawa
- 👤 Toshihide Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:02
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 0
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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) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |