Patent EP0680160A2 successfully refreshed from Google Patents.
US3477698A
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Method and apparatus for additive feeding
Assignee: Dow Chemical Co
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Filing: 1968-04-10
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Granted: 1969-11-11
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Expires: 1988-04-10
Abstract
No abstract record available.
Inventors
- 👤 Vernon J Smith
- 👤 Charles R Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:24
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/18; B29C45/1816; B29C48/00; B29C48/25; B29C48/285; B29C48/288; B29C48/29; B29C48/03; B29K; B29K2105/00; B29K2105/0005
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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |