Patent US3404279A successfully refreshed from Google Patents.
US3404279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulated light detector
Assignee: McDonnell Douglas Corp
•
Filing: 1965-04-05
•
Granted: 1968-10-01
•
Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Matare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:23
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; G; G02; G02F; G02F2/00; G02F2/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A RECEIVER FOR MODULATED OPTICAL FREQUENCY BEAMS, COMPRISING: A BICRYSTAL INCLUDING A JUNCTION AREA SENSITIVE TO OPTICAL FREQUENCY ELECTROMAGNETIC WAVES, SAID BICRYSTAL HAVING ELECTRICL CHARACTERISTICS WHICH VARY ACCORDING TO THE FREQUENCY OF ELECTROMAGNETIC WAVES INCIDENT THEREON AND ALSO ACCORDING TO VOLTAGES IMPRESSED THEREACROSS; LENS MEANS FOR DIRECTING A MODULATED ELECTROMAGNETIC BEAM OF OPTICAL FREQUENCIES ON SAID JUNCTION AREA OF SAID BICRYSTAL; MEANS FOR IMPRESSING, ACROSS SAID JUNCTION AREA OF SAID BICRYSTAL, A LOCAL HETERODYNING SIGNAL OF THE SAME ORDER OF MAGNITUDE AS THE HIGHEST MODULATING FREQUENCY OF SAID MODULATED ELECTROMAGNETIC BEAM OF PRODUCE BEAT FREQUENCY SIGNALS THEREWITH, AND
Claim 2
Dependent Claim
98 words
A RECEIVER FOR MODULATED OPTICAL FREQUENCY BEAMS, COMPRISING: A BICRYSTAL INCLUDING A JUNCTION AREA SENSITIVE TO OPTICAL FREQUENCY ELECTROMAGNETIC WAVES, SAID BICRYSTAL HAVING ELECTRICL CHARACTERISTICS WHICH VARY ACCORDING TO THE FREQUENCY OF ELECTROMAGNETIC WAVES INCIDENT THEREON AND ALSO ACCORDING TO VOLTAGES IMPRESSED THEREACROSS; LENS MEANS FOR DIRECTING A MODULATED ELECTROMAGNETIC BEAM OF OPTICAL FREQUENCIES ON SAID JUNCTION AREA OF SAID BICRYSTAL; MEANS FOR IMPRESSING, ACROSS SAID JUNCTION AREA OF SAID BICRYSTAL, A LOCAL HETERODYNING SIGNAL OF THE SAME ORDER OF MAGNITUDE AS THE HIGHEST MODULATING FREQUENCY OF SAID MODULATED ELECTROMAGNETIC BEAM OF PRODUCE BEAT FREQUENCY SIGNALS THEREWITH, AND
References Cited (Backward Citations)
US2582850A
Cited
US2670441A
Cited
US3196274A
Cited
US3259015A
Cited
US3170067A
Cited
US3245314A
Cited
US3237011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |