Patent US3535689A successfully refreshed from Google Patents.
US3535689A
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US
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Method and circuit arrangement to connect subscriber telephone stations and handsets via radio in telephone systems
Assignee: International Standard Electric Corp
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Filing: 1967-12-27
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Granted: 1970-10-20
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Expires: 1987-12-27
Abstract
No abstract record available.
Inventors
- 👤 Hoeckley S Oden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/08; H04M1/00; H04M1/02; H04M1/03; H04M1/72; H04M1/725; H04M9/00; H04M9/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124657A
Cited
US2064894A
Cited
US3182137A
Cited
US3193623A
Cited
US3217254A
Cited
US3277358A
Cited
US3443035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |