US2451031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Map making and projection instrument
Assignee: Individual
•
Filing: 1946-05-15
•
Granted: 1948-10-12
•
Expires: 1966-05-15
Abstract
No abstract record available.
Inventors
- 👤 Harry T Kelsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:13
CPC Classifications
G; G01; G01C; G01C11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1910425A
Cited
US1980981A
Cited
US1937711A
Cited
US2200594A
Cited
US2309627A
Cited
US2365613A
Cited
US2411155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |