Patent US1439552A successfully refreshed from Google Patents.
US1439552A
Expired / Lapsed
US
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Safety appliance for door locks
Assignee: Individual
•
Filing: 1921-08-19
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Granted: 1922-12-19
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Expires: 1941-08-19
Abstract
No abstract record available.
Inventors
- 👤 Glen E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:39
CPC Classifications
E; E05; E05B; E05B17/00; E05B17/14; Y; Y10; Y10S; Y10S292/00; Y10S292/02; Y10S70/00; Y10S70/58; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/554; Y10T70/5611; Y10T70/5757; Y10T70/5765; Y10T70/577; Y10T70/5774; Y10T70/5779; Y10T70/5854; Y10T70/5867; Y10T70/70; Y10T70/7441; Y10T70/7915; Y10T70/7955; Y10T70/796; Y10T70/7977; Y10T70/7983
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) | 1925-12-18 | 1926-06-19 | 1926-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-12-18 | 1930-06-19 | 1930-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-12-18 | 1934-06-19 | 1934-12-19 | $7700.00 | Window Closed / Lapsed |