Patent US3377189A successfully refreshed from Google Patents.
US3377189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furfural resin coated siliceous material and process of making same
Assignee: WR Grace and Co
•
Filing: 1964-10-01
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Granted: 1968-04-09
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Expires: 1984-10-01
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth G Acker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:38
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998; Y10T428/31504; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2174887A
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US2314181A
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US2345966A
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US2333151A
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US2739076A
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US2755204A
Cited
US2876133A
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US2909450A
Cited
US3068185A
Cited
US3041156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |