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US3434538A
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US
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Retrievable bridge plug
Assignee: Dresser Industries Inc
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Filing: 1966-09-26
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Granted: 1969-03-25
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Marion D Kilgore
- 👤 Robert C Pumpelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/004; E21B23/006; E21B23/06; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1291; E21B33/1292; E21B33/1294; E21B41/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3308886A
Cited
US3249149A
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US3288219A
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US3306360A
Cited
US3339637A
Cited
US3356142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |