Patent US3752413A successfully refreshed from Google Patents.
US3752413A
Expired / Lapsed
US
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Bulk film rewind apparatus
Assignee: Leira Corp
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Filing: 1971-11-15
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Granted: 1973-08-14
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Expires: 1991-11-15
Abstract
Abstract A bulk film rewind apparatus including a light gate structure wherein the light gate is coordinated with the apparatus cover so as to lock said cover closed when the light gate is in open position.
Inventors
- 👤 J Caruso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:39
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43; G03B21/54; G03B21/64
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A bulk film rewind apparatus comprising, in combination, a housing having a bulk film chamber and a spool rewind chamber, a passageway connecting said chambers and through which a film web is threaded, a semi-circular recess in said passageway through which said film passes, and a semi-circular light gate in said recess movable into surface engagement with the film to prevent passage of light into the bulk film chamber.
Claim 2
Dependent Claim
69 words
A bulk film rewind apparatus comprising, in combination, a housing having a bulk film chamber and a spool rewind chamber, a passageway connecting said chambers and through which a film web is threaded, a semi-circular recess in said passageway through which said film passes, and a semi-circular light gate in said recess movable into surface engagement with the film to prevent passage of light into the bulk film chamber.
Claim 3
Dependent Claim
28 words
The apparatus recited in claim 1, in which a cover is provided for the spool rewind chamber and means is provided to lock said cover in closed position.
Claim 4
Dependent Claim
35 words
The apparatus recited in claim 1, in which a cover is provided for the spool rewind chamber and means is provided responsive to the position of the light gate for locking and unlocking said cover.
Claim 5
Dependent Claim
27 words
The apparatus recited in claim 3, in which the locking means comprises a lug on the cover and means on the light gate engageable with said lug.
Claim 6
Dependent Claim
18 words
The apparatus recited in claim 4, in which the means on the light gate comprises a notched disc.
Claim 7
Dependent Claim
19 words
The apparatus recited in claim 1, in which operable means for the light gate is arranged outside said housing.
Claim 8
Dependent Claim
28 words
The apparatus recited in claim 6, in which spring detent means is associated with the operable means to resist its movement into light gate open and closed positions.
Claim 9
Dependent Claim
21 words
The apparatus recited in claim 7, in which the spring for said spring detent means is enclosed within the light gate.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |