US3461577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and an apparatus for displacing materials
Assignee: Southwest Research Institute
•
Filing: 1965-12-15
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Granted: 1969-08-19
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Expires: 1985-12-15
Abstract
No abstract record available.
Inventors
- 👤 John M Clark Jr
- 👤 Robinson W Brown
- 👤 Roger H Hemion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:36
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/8883; E02F5/00; E02F5/02; F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/035; F16K47/00; F16K47/01; F16K47/011; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/785
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |