US3475334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fracturing
Assignee: Dow Chemical Co
•
Filing: 1966-04-21
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Granted: 1969-10-28
•
Expires: 1986-04-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Boudreaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2689230A
Cited
US2879268A
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US3072635A
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US3281354A
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US3356519A
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US3319716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |