US3525401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumpable plastic pistons and their use
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1968-08-12
•
Granted: 1970-08-25
•
Expires: 1988-08-12
Abstract
No abstract record available.
Inventors
- 👤 Harry R Hanson
- 👤 Thomas W Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:57
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08; B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/043; B08B9/0436; B08B9/053; B08B9/055; B08B9/0557; H; H02; H02G; H02G1/00; H02G1/06; H02G1/08; H02G1/086; H02G1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1531437A
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US2633808A
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US3159219A
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US3064731A
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US3055424A
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US3049382A
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US3226463A
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US3346045A
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US3373816A
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US3394760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |