US3240118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual slide projector apparatus for producing transition effects
Assignee: MRS LOUIS BOSE
•
Filing: 1962-11-21
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Granted: 1966-03-15
•
Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 William H Van Marter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:34
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
TRANSPARENCY PROJECTION APPARATUS ACCESSORY, COMPRISING A CASE HAVING A COVER OPERABLE TO DEFINE A SUPPORT, MEANS ON SAID COVER FOR RELEASABLY SUPPORTING A PAIR OF PROJECTION MACHINES, A PAIR OF MASKS ROTATABLY SUPPORTED IN SAID CASE IN POSITIONS TO ROTATE IN FRONT OF A RESPECTIVE PROJECTING LENS SYSTEM OF EACH OF SAID PROJECTORS, EACH MASK INCLUDING A FIRST, CLEAR PORTION, A SECOND PORTION ADJACENT SAID FIRST PORTION AND UNIFORMLY VARYING OVER ITS LENGTH FROM ZERO TO COMPLETE OPAQUENESS, A THIRD PORTION ADJACENT SAID SECOND PORTION AND BEING COMPLETELY OPAQUE, AND A FOURTH PORTION DISPOSED BETWEEN SAID FIRST AND SAID THIRD PORTIONS AND UNIFORMLY VARYING OVER ITS LENGTH FROM COMPLETE TO ZERO OPAQUENESS, AND MEANS IN SAID CASE FOR ROTATING SAID MASKS AT UNIFORM SPEED IN FRONT OF SAID LENS SYSTEMS AND IN SUCH TIMED RELATION AS TO UNIFORMLY BUT INVERSELY VARY THE BRIGHTNESS OF THE IMAGES PROJECTED BY SAID MACHINES, BETWEEN ZERO AND FULL BRIGHTNESS.
Claim 2
Dependent Claim
155 words
TRANSPARENCY PROJECTION APPARATUS ACCESSORY, COMPRISING A CASE HAVING A COVER OPERABLE TO DEFINE A SUPPORT, MEANS ON SAID COVER FOR RELEASABLY SUPPORTING A PAIR OF PROJECTION MACHINES, A PAIR OF MASKS ROTATABLY SUPPORTED IN SAID CASE IN POSITIONS TO ROTATE IN FRONT OF A RESPECTIVE PROJECTING LENS SYSTEM OF EACH OF SAID PROJECTORS, EACH MASK INCLUDING A FIRST, CLEAR PORTION, A SECOND PORTION ADJACENT SAID FIRST PORTION AND UNIFORMLY VARYING OVER ITS LENGTH FROM ZERO TO COMPLETE OPAQUENESS, A THIRD PORTION ADJACENT SAID SECOND PORTION AND BEING COMPLETELY OPAQUE, AND A FOURTH PORTION DISPOSED BETWEEN SAID FIRST AND SAID THIRD PORTIONS AND UNIFORMLY VARYING OVER ITS LENGTH FROM COMPLETE TO ZERO OPAQUENESS, AND MEANS IN SAID CASE FOR ROTATING SAID MASKS AT UNIFORM SPEED IN FRONT OF SAID LENS SYSTEMS AND IN SUCH TIMED RELATION AS TO UNIFORMLY BUT INVERSELY VARY THE BRIGHTNESS OF THE IMAGES PROJECTED BY SAID MACHINES, BETWEEN ZERO AND FULL BRIGHTNESS.
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |