US3273953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture projector film focus stabilization and lens cooling means
Assignee: Individual
•
Filing: 1965-02-26
•
Granted: 1966-09-20
•
Expires: 1985-02-26
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Davee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:42
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/16; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
FILM FOCUS STABILIZING MEANS IN A MOTION PICTURE PROJECTION APPARATUS HAVING A CURVED FILM GATE HAVING A LIGHT APERTURE THERETHROUGH, MEANS FOR INTERMITTENTLY FEEDING THE FILM ALONG CURVED FILM GATE SHOES EXTENDING LONGITUDINALLY ON OPPOSITE EDGES OF SAID FILM GATE AND PAST THE LIGHT APERTURE, AND FILM GATE SPRING TRAP SHOES MAINTAINING THE LONGITUDINAL OPPOSITE SIDE EDGES OF THE FEEDING FILM AGAINST SAID CURVED FILM GATE SHOES AND PAST SAID LIGHT APERTURE; SAID STABILIZING MEANS COMPRISING A PRESSURE CHAMBER INCLUDING SAID CURVED FILM GATE AND THE FILM IN SAID LIGHT APERTURE AS ONE WALL THEREOF, MEANS FOR CONTINUOUSLY PROVIDING A GENERALLY UNIFORM AIR PRESSURE IN SAID PRESSURE CHAMBER AGAINST SUBSTANTIALLY THE ENTIRE SURFACE OF THE FILM IN SAID LIGHT APERTURE, SAID PRESSURE CHAM-
Claim 2
Dependent Claim
123 words
FILM FOCUS STABILIZING MEANS IN A MOTION PICTURE PROJECTION APPARATUS HAVING A CURVED FILM GATE HAVING A LIGHT APERTURE THERETHROUGH, MEANS FOR INTERMITTENTLY FEEDING THE FILM ALONG CURVED FILM GATE SHOES EXTENDING LONGITUDINALLY ON OPPOSITE EDGES OF SAID FILM GATE AND PAST THE LIGHT APERTURE, AND FILM GATE SPRING TRAP SHOES MAINTAINING THE LONGITUDINAL OPPOSITE SIDE EDGES OF THE FEEDING FILM AGAINST SAID CURVED FILM GATE SHOES AND PAST SAID LIGHT APERTURE; SAID STABILIZING MEANS COMPRISING A PRESSURE CHAMBER INCLUDING SAID CURVED FILM GATE AND THE FILM IN SAID LIGHT APERTURE AS ONE WALL THEREOF, MEANS FOR CONTINUOUSLY PROVIDING A GENERALLY UNIFORM AIR PRESSURE IN SAID PRESSURE CHAMBER AGAINST SUBSTANTIALLY THE ENTIRE SURFACE OF THE FILM IN SAID LIGHT APERTURE, SAID PRESSURE CHAM-
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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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |