US3302515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection apparatus or system provided with concave reflector
Assignee: Alos AG
•
Filing: 1964-05-15
•
Granted: 1967-02-07
•
Expires: 1984-05-15
Abstract
No abstract record available.
Inventors
- 👤 Jean A Knus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
PROJECTION SYSTEM COMPRISING A PROJECTION SCREEN, AN OBJECTIVE AND AN ILLUMINATING APPARATUS, SAID ILLUMINATING APPARATUS INCORPORATING A LIGHT SOURCE, A CONDENSER AND A CONCAVE REFLECTOR, SAID CONCAVE REFLECTOR BEING PROVIDED WITH MEANS MODIFYING THE REFLECTION CAPABILITY THEREOF SUCH THAT IT GRADUALLY DECREASES FROM THE OUTSIDE TOWARDS THE CENTER OF SAID CONCAVE REFLECTOR, SAID MODIFYING MEANS COMPRISING A REFLECTING METAL COVERING WHICH REDUCES IN THICKNESS TOWARDS THE CENTER OF SAID CONCAVE REFLECTOR.
Claim 2
Dependent Claim
71 words
PROJECTION SYSTEM COMPRISING A PROJECTION SCREEN, AN OBJECTIVE AND AN ILLUMINATING APPARATUS, SAID ILLUMINATING APPARATUS INCORPORATING A LIGHT SOURCE, A CONDENSER AND A CONCAVE REFLECTOR, SAID CONCAVE REFLECTOR BEING PROVIDED WITH MEANS MODIFYING THE REFLECTION CAPABILITY THEREOF SUCH THAT IT GRADUALLY DECREASES FROM THE OUTSIDE TOWARDS THE CENTER OF SAID CONCAVE REFLECTOR, SAID MODIFYING MEANS COMPRISING A REFLECTING METAL COVERING WHICH REDUCES IN THICKNESS TOWARDS THE CENTER OF SAID CONCAVE REFLECTOR.
References Cited (Backward Citations)
US1665660A
Cited
US2356694A
Cited
US2117737A
Cited
US2308009A
Cited
US2309788A
Cited
US2384578A
Cited
US2415635A
Cited
US2751816A
Cited
US3184585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |