US3535636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transceiver which tests both transmitting and receiving frequencies before making a call
Assignee: US Philips Corp
•
Filing: 1967-11-30
•
Granted: 1970-10-20
•
Expires: 1987-11-30
Abstract
No abstract record available.
Inventors
- 👤 Dirk Muilwijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:21
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502; H04M1/72505; H04W72/40; H04W24/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3426279A
Cited
US3443228A
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 |