US2075815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a volute spring
Assignee: Individual
•
Filing: 1934-09-29
•
Granted: 1937-04-06
•
Expires: 1954-09-29
Abstract
No abstract record available.
Inventors
- 👤 Harry A Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:59
CPC Classifications
B; B21; B21F; B21F3/00; B21D; B21D11/00; B21D11/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T29/4981; Y10T29/49812
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) | 1940-04-05 | 1940-10-05 | 1941-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-05 | 1944-10-05 | 1945-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-05 | 1948-10-05 | 1949-04-06 | $7700.00 | Window Closed / Lapsed |