US3443312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making gas-filled enclosed switchgear with copper contacts
Assignee: Hitachi Ltd
•
Filing: 1965-10-06
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Granted: 1969-05-13
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Expires: 1985-10-06
Abstract
No abstract record available.
Inventors
- 👤 Hiromi Moriyama
- 👤 Hiroshi Yamada
- 👤 Tsunemoto Nakanishi
- 👤 Toshikatsu Kiriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:47
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/28; H01H51/281; H01H1/00; H01H1/02; H01H1/0201; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49105; Y10T29/49117; Y10T29/49204
Claims Analysis
Total Claims: 0
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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) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |