US3393690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosity control in pipeline operations
Assignee: Shell USA Inc
•
Filing: 1964-12-03
•
Granted: 1968-07-23
•
Expires: 1984-12-03
Abstract
No abstract record available.
Inventors
- 👤 Paul T Chu
- 👤 Kent R Shellene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:36
CPC Classifications
F; F16; F16L; F16L53/00; F16L53/30; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1016958A
Cited
US1454485A
Cited
US1893372A
Cited
US2206553A
Cited
US2866602A
Cited
US2981747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |