Patent US3021785A successfully refreshed from Google Patents.
US3021785A
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Counterforce initiation
Assignee: Dow Chemical Co
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Filing: 1959-05-04
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Granted: 1962-02-20
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Expires: 1979-05-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Hradel
- 👤 John C Cline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:38
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US927968A
Cited
US1242838A
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US2468274A
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US2511005A
Cited
FR1109173A
Cited
US2877708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |