Patent US2528428A successfully refreshed from Google Patents.
US2528428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic heating apparatus
Assignee: Cutler Hammer Inc
•
Filing: 1946-04-25
•
Granted: 1950-10-31
•
Expires: 1966-04-25
Abstract
No abstract record available.
Inventors
- 👤 Lester D Drugmand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:49
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/46; H05B6/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2231457A
Cited
GB518691A
Cited
US2342846A
Cited
US2333412A
Cited
US2288269A
Cited
US2397615A
Cited
US2436732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |