Patent US2556838A successfully refreshed from Google Patents.
US2556838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condenser
Assignee: Individual
•
Filing: 1949-09-30
•
Granted: 1951-06-12
•
Expires: 1969-09-30
Abstract
No abstract record available.
Inventors
- 👤 Rufus H Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:24
CPC Classifications
H; H01; H01G; H01G5/00; H01G5/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1589204A
Cited
US1641314A
Cited
US1746967A
Cited
US1968772A
Cited
GB483487A
Cited
US2273522A
Cited
US2384384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |