Patent US2927643A successfully refreshed from Google Patents.
US2927643A
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US
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Assignee: —
•
Filing: 1955-09-21
•
Granted: 1960-03-08
•
Expires: 1975-09-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:36
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL70001C
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US1895132A
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US2087528A
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US2211206A
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US2174001A
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US2162179A
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US2143251A
Cited
US2259429A
Cited
US2335355A
Cited
US2673615A
Cited
US2766828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |