Patent US1720838A successfully refreshed from Google Patents.
US1720838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination lock and key
Assignee: Individual
•
Filing: 1923-03-05
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Granted: 1929-07-16
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Expires: 1943-03-05
Abstract
No abstract record available.
Inventors
- 👤 Juan De Castro Y Plans
- 👤 Heirs Carmen Iznaga Y Ruiz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:15
CPC Classifications
E; E05; E05B; E05B35/00; E05B35/08; E05B35/083; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5246; Y10T70/5296; Y10T70/5319; Y10T70/5327; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7497; Y10T70/7503; Y10T70/7508; Y10T70/7559; Y10T70/7588; Y10T70/7593; Y10T70/7729; Y10T70/7734; Y10T70/778; Y10T70/7791; Y10T70/7881; Y10T70/7893
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) | 1932-07-15 | 1933-01-14 | 1933-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-07-15 | 1937-01-14 | 1937-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-07-15 | 1941-01-14 | 1941-07-16 | $7700.00 | Window Closed / Lapsed |