Patent US567387A successfully refreshed from Google Patents.
Patent US3087995A successfully refreshed from Google Patents.
US3087995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplex communication transmitters
Assignee: Westinghouse Electric Corp
•
Filing: 1960-04-12
•
Granted: 1963-04-30
•
Expires: 1980-04-12
Abstract
No abstract record available.
Inventors
- 👤 Hellstrom Melbourne John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:19
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04J; H04J9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A MULTIPLEX COMMUNICATION SYSTEM COMPRISING MEANS TO GENERATE A RADIO FREQUENCY CARRIER WAVE, MEANS TO FREQUENCY MODULATE SAID CARRIER WAVE IN ACCORDANCE WITH A FIRST INTELLIGENCE SIGNAL THEREBY CREATING FREQUENCY DEVIATIONS CORRESPONDING TO SAID SIGNAL, MEANS TO AMPLITUDE MODULATE SAID CARRIER WAVE IN ACCORDANCE WITH A SECOND INTELLIGENCE SIGNAL, SAID AMPLITUDE MODULATION MEANS INCLUDING MEANS FOR EFFECTIVELY MULTIPLYING SAID SECOND SIGNAL BY A PRECORRECTION FACTOR WHICH VARIES AS A FUNCTION OF SAID FREQUENCY DEVIATIONS AND SUBSTANTIALLY IN PROPORTION TO AND OPPOSITELY TO THE DISTORTION EXPECTED TO OCCUR IN A CONVENTIONAL BROADCAST RECEIVER, WHEREBY SAID SECOND INTELLIGENCE SIGNAL WILL BE DETECTABLE IN CONVENTIONAL RECEIVERS WITHOUT SUBSTANTIAL INTERFERENCE FROM THE FREQUENCY MODULATION.
Claim 2
Dependent Claim
110 words
A MULTIPLEX COMMUNICATION SYSTEM COMPRISING MEANS TO GENERATE A RADIO FREQUENCY CARRIER WAVE, MEANS TO FREQUENCY MODULATE SAID CARRIER WAVE IN ACCORDANCE WITH A FIRST INTELLIGENCE SIGNAL THEREBY CREATING FREQUENCY DEVIATIONS CORRESPONDING TO SAID SIGNAL, MEANS TO AMPLITUDE MODULATE SAID CARRIER WAVE IN ACCORDANCE WITH A SECOND INTELLIGENCE SIGNAL, SAID AMPLITUDE MODULATION MEANS INCLUDING MEANS FOR EFFECTIVELY MULTIPLYING SAID SECOND SIGNAL BY A PRECORRECTION FACTOR WHICH VARIES AS A FUNCTION OF SAID FREQUENCY DEVIATIONS AND SUBSTANTIALLY IN PROPORTION TO AND OPPOSITELY TO THE DISTORTION EXPECTED TO OCCUR IN A CONVENTIONAL BROADCAST RECEIVER, WHEREBY SAID SECOND INTELLIGENCE SIGNAL WILL BE DETECTABLE IN CONVENTIONAL RECEIVERS WITHOUT SUBSTANTIAL INTERFERENCE FROM THE FREQUENCY MODULATION.
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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |