US3520663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Dow Chemical Co
•
Filing: 1967-12-04
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Granted: 1970-07-14
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Expires: 1987-12-04
Abstract
No abstract record available.
Inventors
- 👤 Harold A Schertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:55
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12264; Y10T428/12292; Y10T428/12361; Y10T428/12375
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067620A
Cited
US2162902A
Cited
US2386030A
Cited
US2516896A
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US2635012A
Cited
US2514242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |