US3402965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing injection and withdrawal point in a solution mining cavity
Assignee: PPG Industries Inc
•
Filing: 1966-03-11
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Granted: 1968-09-24
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Expires: 1986-03-11
Abstract
No abstract record available.
Inventors
- 👤 James B Dahms
- 👤 Byron P Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:00
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/29; E21B43/292; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6918; Y10T137/6962
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) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |