Patent US2540169A successfully refreshed from Google Patents.
US2540169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular
Assignee: —
•
Filing: —
•
Granted: 1951-02-06
•
Expires: 1968-02-06
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:11
CPC Classifications
B; B25; B25G; B25G3/00; B25G3/02; B25G3/12; B25G3/26; E; E04; E04F; E04F19/00; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7075; Y10T403/7077; Y10T403/7079
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US454126A
Cited
US603903A
Cited
US957259A
Cited
US977862A
Cited
US1025349A
Cited
US1050473A
Cited
US1172355A
Cited
US1434414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |