US2818237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling means
Assignee: Individual
•
Filing: 1955-10-27
•
Granted: 1957-12-31
•
Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 Carlton G Lehr
- 👤 Ephraim M Sparrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:36
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/005; H01J19/00; H01J19/28; H01J19/32; H01J19/36; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191313232A
Cited
GB332455A
Cited
US1874478A
Cited
US1983549A
Cited
CH246793A
Cited
US2653800A
Cited
US2680009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |