US2850225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Wisconsin Alumni Research Foundation
•
Filing: 1955-11-10
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Granted: 1958-09-02
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 Raymond G Herb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:40
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/14; H01J41/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB262069A
Cited
US2100045A
Cited
US2153786A
Cited
US2636664A
Cited
US2727167A
Cited
US2755014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |