Patent US3549525A successfully refreshed from Google Patents.
US3549525A
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Partially deactivated silicon dioxide adsorbents and method
Assignee: Merck KGaA
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Filing: 1969-08-20
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Granted: 1970-12-22
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Expires: 1989-08-20
Abstract
No abstract record available.
Inventors
- 👤 Knut Klatyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:46
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/286; B01J20/02; B01J20/10; B01J20/103; B01J20/22; B01J20/26; B01J20/261; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28057; B01J20/28069; B01J20/28078; B01J20/30; B01J20/3092; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/58
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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |