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Patent US3507974A successfully refreshed from Google Patents.
US3507974A
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Electromagnetic shielded door structure
Assignee: United States Department of the Navy
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Filing: 1968-03-06
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Granted: 1970-04-21
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Expires: 1988-03-06
Abstract
No abstract record available.
Inventors
- 👤 Don B Clark
- 👤 Theodore J Roster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:33
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/0015; Y; Y10; Y10S; Y10S277/00; Y10S277/92; Y10S277/921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2757225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |