US3472769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid systems having improved friction characteristics
Assignee: Pan American Petroleum Corp
•
Filing: 1967-06-19
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Granted: 1969-10-14
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Expires: 1987-06-19
Abstract
No abstract record available.
Inventors
- 👤 James L Lummus
- 👤 Billy V Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:02
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C09K8/20; C09K8/206; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2778427A
Cited
US2775557A
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US3081260A
Cited
US3102548A
Cited
US3338320A
Cited
US3323603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |