Patent US3229210A successfully refreshed from Google Patents.
US3229210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase sensitive demodulator operating on bi-polar amplitude modulated signals
Assignee: North American Aviation Corp
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Filing: 1961-12-28
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Granted: 1966-01-11
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Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Andrew A Frank
- 👤 Ronald O Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:13
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/08; H03D1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
APPARATUS FOR SHAPING AN AMPLITUDE MODULATED ALTERNATING CURRENT INPUT SIGNAL COMPRISING MEANS FOR GENERATING AN ALTERNATING CURRENT BIAS SIGNAL, MEANS FOR COMBINING SAID BIAS SIGNAL WITH SAID INPUT SIGNAL, A FIRST HALFWAVE RECTIFIER RESPONSIVELY CONNECTED TO SAID COMBINING MEANS, A FIRST FILTER RESPONSIVELY CONNECTED TO SAID RECTIFIER, A SHAPING NETWORK RESPONSIVELY CONNECTED TO SAID FILTER, A SECOND HALF-WAVE RECTIFIER RESPONSIVELY CONNECTED TO SAID BIAS SIGNAL GENERATING MEANS AND OPPOSITELY POLED RELATIVE TO SAID FIRST RECTIFIER, A SECOND FILTER RESPONSIVELY CONNECTED TO SAID SECOND RECTIFIER, A FIRST RESISTOR CONNECTED AT ONE END THEREOF TO SAID SHAPING NETWORK, A SECOND RESISTOR CONNECTED AT ONE END THEREOF TO SAID SECOND FILTER AND CONNECTED AT ITS OTHER END TO THE OTHER END OF SAID FIRST RESISTOR, AND A MODULATOR CONNECTED TO THE CONNECTION BETWEEN SAID RESISTORS.
Claim 2
Dependent Claim
132 words
APPARATUS FOR SHAPING AN AMPLITUDE MODULATED ALTERNATING CURRENT INPUT SIGNAL COMPRISING MEANS FOR GENERATING AN ALTERNATING CURRENT BIAS SIGNAL, MEANS FOR COMBINING SAID BIAS SIGNAL WITH SAID INPUT SIGNAL, A FIRST HALFWAVE RECTIFIER RESPONSIVELY CONNECTED TO SAID COMBINING MEANS, A FIRST FILTER RESPONSIVELY CONNECTED TO SAID RECTIFIER, A SHAPING NETWORK RESPONSIVELY CONNECTED TO SAID FILTER, A SECOND HALF-WAVE RECTIFIER RESPONSIVELY CONNECTED TO SAID BIAS SIGNAL GENERATING MEANS AND OPPOSITELY POLED RELATIVE TO SAID FIRST RECTIFIER, A SECOND FILTER RESPONSIVELY CONNECTED TO SAID SECOND RECTIFIER, A FIRST RESISTOR CONNECTED AT ONE END THEREOF TO SAID SHAPING NETWORK, A SECOND RESISTOR CONNECTED AT ONE END THEREOF TO SAID SECOND FILTER AND CONNECTED AT ITS OTHER END TO THE OTHER END OF SAID FIRST RESISTOR, AND A MODULATOR CONNECTED TO THE CONNECTION BETWEEN SAID RESISTORS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |