US3517312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone and telegraph switching system utilizing a stationary satellite
Assignee: NEC Corp
•
Filing: 1967-02-23
•
Granted: 1970-06-23
•
Expires: 1987-02-23
Abstract
No abstract record available.
Inventors
- 👤 Shigeki Yamato
- 👤 Tatsuki Watanabe
- 👤 Nobuhiko Shimasaki
- 👤 Shunji Tashiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:33
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/18528
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2670435A
Cited
US2946044A
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US3022375A
Cited
US3141928A
Cited
US3226484A
Cited
US3173996A
Cited
US3292178A
Cited
US3320611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |