US2319940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravitational force measuring apparatus
Assignee: AT&T Inc
•
Filing: 1939-09-12
•
Granted: 1943-05-25
•
Expires: 1959-09-12
Abstract
No abstract record available.
Inventors
- 👤 Warren A Marrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:00
CPC Classifications
G; G01; G01V; G01V7/00; G01V7/12
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) | 1946-05-24 | 1946-11-23 | 1947-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-24 | 1950-11-23 | 1951-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-24 | 1954-11-23 | 1955-05-25 | $7700.00 | Window Closed / Lapsed |