US2029598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swivel
Assignee: Nat Superior Co
•
Filing: 1934-10-22
•
Granted: 1936-02-04
•
Expires: 1954-10-22
Abstract
No abstract record available.
Inventors
- 👤 Timbs Edward
- 👤 Demery A Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-02-03 | 1939-08-05 | 1940-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-03 | 1943-08-05 | 1944-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-03 | 1947-08-05 | 1948-02-04 | $7700.00 | Window Closed / Lapsed |