US2689980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of seamless hollow structures
Assignee: Individual
•
Filing: 1951-03-07
•
Granted: 1954-09-28
•
Expires: 1971-03-07
Abstract
No abstract record available.
Inventors
- 👤 Opavsky Walter Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:30
CPC Classifications
B; B29; B29C; B29C67/00; Y; Y10; Y10S; Y10S425/00; Y10S425/013; Y10S425/041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2345144A
Cited
GB582649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |