US3308715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection system and equipment
Assignee: C S ASHCRAFT Manufacturing CO Inc
•
Filing: 1965-11-01
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Granted: 1967-03-14
•
Expires: 1985-11-01
Abstract
No abstract record available.
Inventors
- 👤 Clarence S Ashcraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:47
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A FILM PROJECTION SYSTEM COMPRISING AN ELLIPSOIDAL MIRROR SEGMENT WITH A FIRST FOCAL POINT AND A SECOND FOCAL POINT ALONG ITS AXIS, SAID FIRST FOCAL POINT BEING SPACED ABOUT 1/6 AS FAR FROM SAID MIRROR AS SAID SECOND FOCAL POINT, SAID MIRROR SEGMENT BEING USED FOR REFLECTING A CONE OF SUBSTANTIALLY HOMOGENOUSLY DISTRIBUTED LIGHT, HIGH INTENSITY LIGHT SOURCE MEANS MOVABLE ALONG SAID AXIS FOR INCREASING AND DECREASING THE AREA OF THE MIRROR USED FOR REFLECTING, SAID LIGHT SOURCE MEANS INCREASING THE ANGLE OF SAID CONE AS SAID MEANS IS
Claim 2
Dependent Claim
89 words
A FILM PROJECTION SYSTEM COMPRISING AN ELLIPSOIDAL MIRROR SEGMENT WITH A FIRST FOCAL POINT AND A SECOND FOCAL POINT ALONG ITS AXIS, SAID FIRST FOCAL POINT BEING SPACED ABOUT 1/6 AS FAR FROM SAID MIRROR AS SAID SECOND FOCAL POINT, SAID MIRROR SEGMENT BEING USED FOR REFLECTING A CONE OF SUBSTANTIALLY HOMOGENOUSLY DISTRIBUTED LIGHT, HIGH INTENSITY LIGHT SOURCE MEANS MOVABLE ALONG SAID AXIS FOR INCREASING AND DECREASING THE AREA OF THE MIRROR USED FOR REFLECTING, SAID LIGHT SOURCE MEANS INCREASING THE ANGLE OF SAID CONE AS SAID MEANS IS
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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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |