US2721748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polish rod packing device
Assignee: EMSCO Manufacturing Co
•
Filing: 1951-02-03
•
Granted: 1955-10-25
•
Expires: 1971-02-03
Abstract
No abstract record available.
Inventors
- 👤 Guglielmo R Tremolada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:47
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1885046A
Cited
US2006529A
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US2041316A
Cited
US2219064A
Cited
US2196676A
Cited
US2256343A
Cited
US2451269A
Cited
US2470960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |