US2518931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave-guide
Assignee: —
•
Filing: —
•
Granted: 1950-08-15
•
Expires: 1967-08-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:44
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H03; H03D; H03D9/00; H03D9/06; H03D9/0608
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2114036A
Cited
US2304377A
Cited
US2453988A
Cited
US2411553A
Cited
US2376785A
Cited
US2434293A
Cited
US2408826A
Cited
US2434294A
Cited
US2427098A
Cited
US2425013A
Cited
US2379395A
Cited
US2445409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |