US2605428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the amplification of minute space currents
Assignee: Individual
•
Filing: 1948-04-22
•
Granted: 1952-07-29
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Henry P Kalmus
- 👤 George O Striker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:44
CPC Classifications
B; B63; B63C; B63C1/00; B63C1/02; B63C1/06; F; F04; F04D; F04D29/00; F04D29/60; F04D29/605; H; H03; H03F; H03F3/00; H03F3/38; H03F3/40; H05; H05H; H05H1/00; H05H1/0006
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |