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Patent US3547684A successfully refreshed from Google Patents.
US3547684A
Expired / Lapsed
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Process for making organic polymer filled gas chromatographic columns
Assignee: Dow Chemical Co
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Filing: 1968-10-17
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Granted: 1970-12-15
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Expires: 1988-10-17
Abstract
No abstract record available.
Inventors
- 👤 Oscar Le Roy Hollis
- 👤 Robert D Acuff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:21
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/264; B01J20/281; B01J20/282; B01J20/285; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/80; B01J2220/86
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) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |