US2668052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maximum security door
Assignee: Individual
•
Filing: 1950-01-13
•
Granted: 1954-02-02
•
Expires: 1970-01-13
Abstract
No abstract record available.
Inventors
- 👤 Paul S Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:56
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E05; E05Y; E05Y2800/00; E05Y2800/40; E05Y2800/406; E05Y2800/407; Y; Y10; Y10T; Y10T292/00; Y10T292/03; Y10T292/08; Y10T292/096; Y10T292/1014; Y10T292/1021
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US650036A
Cited
US703372A
Cited
US842668A
Cited
US899323A
Cited
US1002028A
Cited
US1002195A
Cited
US1022684A
Cited
US1438233A
Cited
US1555174A
Cited
US1626834A
Cited
US1636697A
Cited
US1674862A
Cited
US1868149A
Cited
US1920868A
Cited
US2219344A
Cited
US2558867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |