US3585446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for prevention of static electric discharge on motion picture projector reels
Assignee: Eastman Kodak Co
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Filing: 1969-02-19
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Granted: 1971-06-15
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Expires: 1989-02-19
Abstract
Abstract This disclosure relates to a structure used to prevent the buildup of high voltage static electric charge on the flanges or support hub of motion picture reels. A conductive coating is placed around the nonconductive areas of the connection between the flanges and ground potential so that the accumulation of discharge potentials is prevented.
Inventors
- 👤 Edward S Mckee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:26
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/321; Y; Y10; Y10S; Y10S242/00; Y10S242/906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
Apparatus for preventing the buildup of static charges on film reels of the type having metal flanges, said apparatus comprising: a source of ground potential; a rotatable shaft; electrical insulator support means for mounting the reels on said shaft; and an electrically conductive coating on said support means, said conductive coating being positioned to make good electrical contact with the flanges of a mounted reel and with said source of ground potential to provide a low resistance path between the reel flanges and ground.
Claim 2
Dependent Claim
84 words
Apparatus for preventing the buildup of static charges on film reels of the type having metal flanges, said apparatus comprising: a source of ground potential; a rotatable shaft; electrical insulator support means for mounting the reels on said shaft; and an electrically conductive coating on said support means, said conductive coating being positioned to make good electrical contact with the flanges of a mounted reel and with said source of ground potential to provide a low resistance path between the reel flanges and ground.
Claim 3
Dependent Claim
53 words
Apparatus as defined in claim 1 wherein: said shaft is electrically conductive and is connected to ground; said support means comprises a plastic spindle fixed to said shaft for rotation therewith; and said conductive coating is positioned to provide a low resistance path between the flanges of a received reel and said shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |