Patent US3434543A successfully refreshed from Google Patents.
US3434543A
Expired / Lapsed
US
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Method and apparatus for separating sections of well pipe
Assignee: HOUSTON ENG Inc
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Filing: 1966-03-14
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Granted: 1969-03-25
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Expires: 1986-03-14
Abstract
No abstract record available.
Inventors
- 👤 Derrel D Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:13
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2947520A
Cited
US2848050A
Cited
US2947521A
Cited
US3179177A
Cited
US3179175A
Cited
US3322006A
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 |