US2220592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device
Assignee: CLARENCE W JOHNSTON
•
Filing: 1938-05-20
•
Granted: 1940-11-05
•
Expires: 1958-05-20
Abstract
No abstract record available.
Inventors
- 👤 Winfield D Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:31
CPC Classifications
A; A44; A44B; A44B9/00; A44B9/12; A44B9/14; Y; Y10; Y10T; Y10T24/00; Y10T24/31; Y10T24/312; Y10T24/34; Y10T24/3467; Y10T24/3468; Y10T24/3475; Y10T24/39; Y10T24/3902; Y10T24/3904
Claims Analysis
Total Claims: 0
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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) | 1943-11-05 | 1944-05-06 | 1944-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-05 | 1948-05-06 | 1948-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-05 | 1952-05-06 | 1952-11-05 | $7700.00 | Window Closed / Lapsed |