Patent US3434743A successfully refreshed from Google Patents.
US3434743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well apparatus
Assignee: FMC Corp
•
Filing: 1966-07-07
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Granted: 1969-03-25
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Expires: 1986-07-07
Abstract
No abstract record available.
Inventors
- 👤 Roy A Boeker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:01
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/93; Y10S411/999
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2746773A
Cited
US2709091A
Cited
US2798747A
Cited
US2848255A
Cited
US2935343A
Cited
US3072420A
Cited
US3166345A
Cited
US3221794A
Cited
US3339832A
Cited
US3343581A
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 |