US2579571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1947-03-13
•
Granted: 1951-12-25
•
Expires: 1967-03-13
Abstract
No abstract record available.
Inventors
- 👤 James R Heck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/38; H04B1/40; H04B1/54; H04B1/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1858307A
Cited
US2197029A
Cited
US2129990A
Cited
US2169360A
Cited
US2313122A
Cited
US2324279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |