Patent US2069270A successfully refreshed from Google Patents.
US2069270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic spring and method of making same
Assignee: Transit Research Corp
•
Filing: 1935-05-23
•
Granted: 1937-02-02
•
Expires: 1955-05-23
Abstract
No abstract record available.
Inventors
- 👤 Emil H Piron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:06
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/38; F16F1/393; F16F1/3935; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T403/00; Y10T403/45; Y10T403/455; Y10T403/458
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) | 1940-02-02 | 1940-08-03 | 1941-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-02-02 | 1944-08-03 | 1945-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-02-02 | 1948-08-03 | 1949-02-02 | $7700.00 | Window Closed / Lapsed |