US1587933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the production of double-walled tubes
Assignee: Individual
•
Filing: 1924-09-15
•
Granted: 1926-06-08
•
Expires: 1944-09-15
Abstract
No abstract record available.
Inventors
- 👤 Barme Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:28
CPC Classifications
B; B21; B21C; B21C25/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1929-06-07 | 1929-12-07 | 1930-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-06-07 | 1933-12-07 | 1934-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-06-07 | 1937-12-07 | 1938-06-08 | $7700.00 | Window Closed / Lapsed |