Patent US2733943A successfully refreshed from Google Patents.
US2733943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
nater
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
•
Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:06
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58; E21B10/44; E21B10/445; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7009; Y10T403/7026; Y10T403/7035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1733336A
Cited
US519012A
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US260314A
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US903936A
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GB191205471A
Cited
US1063450A
Cited
US1088481A
Cited
FR628665A
Cited
US1964030A
Cited
US2052019A
Cited
US2233421A
Cited
US2234486A
Cited
FR989393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |