US2770784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal painted aperture or window for waveguides
Assignee: Individual
•
Filing: 1952-06-25
•
Granted: 1956-11-13
•
Expires: 1972-06-25
Abstract
No abstract record available.
Inventors
- 👤 Robert H Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:54
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1651836A
Cited
US2427089A
Cited
US2467730A
Cited
US2546742A
Cited
US2579315A
Cited
FR976767A
Cited
US2704830A
Cited
US2683863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |