US3201861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a double-walled tube
Assignee: Individual
•
Filing: 1960-03-31
•
Granted: 1965-08-24
•
Expires: 1980-03-31
Abstract
No abstract record available.
Inventors
- 👤 Howard A Fromson
- 👤 William B Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:58
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361; Y10T29/49805; Y10T29/49826; Y10T29/49879; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |