US2254510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming tubular structures
Assignee: Individual
•
Filing: 1939-06-17
•
Granted: 1941-09-02
•
Expires: 1959-06-17
Abstract
No abstract record available.
Inventors
- 👤 Bergstein Robert Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:04
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/60; B31B70/64; B31B70/643; B31B2155/00; B31B2160/00; B31B2160/10; B31B2170/00; B31B2170/20; B31B70/74; B31B70/81; B31B70/82
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) | 1944-09-01 | 1945-03-03 | 1945-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-01 | 1949-03-03 | 1949-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-01 | 1953-03-03 | 1953-09-02 | $7700.00 | Window Closed / Lapsed |