US1444381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportion finder
Assignee: Individual
•
Filing: 1921-06-11
•
Granted: 1923-02-06
•
Expires: 1941-06-11
Abstract
No abstract record available.
Inventors
- 👤 Landenberger Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:01
CPC Classifications
G; G06; G06G; G06G1/00; G06G1/0005; G06G1/0047; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7153; Y10T70/7424
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) | 1926-02-05 | 1926-08-07 | 1927-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-02-05 | 1930-08-07 | 1931-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-02-05 | 1934-08-07 | 1935-02-06 | $7700.00 | Window Closed / Lapsed |