US3536833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for concealing communications signals
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
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Filing: 1965-07-08
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Granted: 1970-10-27
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Expires: 1985-07-08
Abstract
Abstract 1,056,392. Data transmission. PATELHOLD PATENTVERWERTUNGS- & ELEKTRO-HOLDING A.G. July 29, 1965 [July 31. 1964], No. 32456/65. Heading H4P. Digital data is ciphered by algebraic addition of groups of data pulses with equal length groups of cipher pulses. Any carry digit resulting from addition of the highest digits is suppressed at the transmitter. At the receiver the reverse process takes place, the carry digit being reinstated if the result would otherwise be negative. Preferably the ciphered data is converted to analogue form for transmission.
Inventors
- 👤 Gustav Guanella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:26
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/02
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) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |