US2839855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Displays
Assignee: Individual
•
Filing: 1956-04-26
•
Granted: 1958-06-24
•
Expires: 1976-04-26
Abstract
No abstract record available.
Inventors
- 👤 John M Palmer
- 👤 Rudolf A Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:05
CPC Classifications
G; G09; G09F; G09F11/00; G09F11/02; G09F11/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1304899A
Cited
US1081001A
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US1256645A
Cited
FR541170A
Cited
US1463108A
Cited
GB259723A
Cited
CH127138A
Cited
CH183085A
Cited
US2202417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |