US4296857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective band for photosensitive film on spools
Assignee: Bayer CropScience Inc USA
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Filing: 1980-01-16
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Granted: 1981-10-27
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Expires: 2000-01-16
Abstract
Abstract Photosensitive film carried on spools is ordinarily protected from ambient light by opaque covering strips which must be manually removed. Removal of these strips often causes some exposure and wastage of the film. The present invention discloses a protective band which removes itself when the film is fed out under tension.
Inventors
- 👤 William V. Huck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:32
CPC Classifications
G; G03; G03C; G03C3/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A spool and photosensitive film comprising a core and flanges extending from the core and having photosensitive film wrapped in a spiral about the core and between the flanges having as an improvement thereon an opaque band having a width nearly equal to or greater than the width between the flanges, a length in excess of the circumference of the outermost layer of film on the spool, so that the band overlaps itself, and a pitch in its relaxed state of from one eighth to eight times the width of the band, and a portion of the film extending out from the area where the band overlaps itself.
Claim 2
Dependent Claim
108 words
A spool and photosensitive film comprising a core and flanges extending from the core and having photosensitive film wrapped in a spiral about the core and between the flanges having as an improvement thereon an opaque band having a width nearly equal to or greater than the width between the flanges, a length in excess of the circumference of the outermost layer of film on the spool, so that the band overlaps itself, and a pitch in its relaxed state of from one eighth to eight times the width of the band, and a portion of the film extending out from the area where the band overlaps itself.
Claim 3
Dependent Claim
24 words
The spool and film of claim 1 wherein the opaque band has a width between 0.95 and 1.15 times the width between the flanges.
Claim 4
Dependent Claim
16 words
The spool and film of claim 1 wherein said band is made of metal or plastic.
Claim 5
Dependent Claim
23 words
The spool and film of claim 3 wherein said band has a width between 0.98 and 1.10 times the width between the flanges.
Claim 6
Dependent Claim
13 words
The spool and film of claim 1 wherein said film is unexposed microfilm.
Claim 7
Dependent Claim
13 words
The spool and film of claim 3 wherein said film is unexposed microfilm.
Claim 8
Dependent Claim
37 words
The spool and film of claim 2 wherein the end of the band which is outermost over the film is cut at an acute angle away from the direction toward which the band is disposed to curl.
Claim 9
Dependent Claim
37 words
The spool and film of claim 3 wherein the band has sufficient circular or helical axial orientation in its relaxed state so as to have its ends overlap or pass by each other in its axial direction.
Claim 10
Dependent Claim
18 words
The spool and film of claim 3 wherein the band has a thickness between 0.003 and 0.050 inches.
Claim 11
Dependent Claim
29 words
The spool and film of claim 1 wherein the pitch of the band in its relaxed state is from one half to eight times the width of the band.
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |