US2770900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Program indicator
Assignee: Individual
•
Filing: 1951-10-31
•
Granted: 1956-11-20
•
Expires: 1971-10-31
Abstract
No abstract record available.
Inventors
- 👤 Robert E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:39
CPC Classifications
G; G04; G04C; G04C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1491694A
Cited
US983682A
Cited
US979946A
Cited
GB191316444A
Cited
US1672389A
Cited
US1773670A
Cited
US2069372A
Cited
US2113369A
Cited
US2537974A
Cited
US2610792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |