US2877568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subject-matter trainer
Assignee: Individual
•
Filing: 1956-03-28
•
Granted: 1959-03-17
•
Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 Guy G Besnard
- 👤 Leslie J Briggs
- 👤 Elbert S Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2311055A
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US1749226A
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US1929872A
Cited
US2104718A
Cited
US2157058A
Cited
US2213974A
Cited
US2317107A
Cited
US2349066A
Cited
US2401434A
Cited
US2564089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |