US2727801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Course recorder
Assignee: Individual
•
Filing: 1953-04-06
•
Granted: 1955-12-20
•
Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Skillman Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:22
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20; G01C21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1427267A
Cited
US1493473A
Cited
US1701582A
Cited
US2437243A
Cited
US2369922A
Cited
US2424118A
Cited
US2670414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |