Patent US5319407A successfully refreshed from Google Patents.
US5319407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film cassette with interacting spool lock and light shield
Assignee: Eastman Kodak Co
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Filing: 1993-06-16
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Granted: 1994-06-07
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Expires: 2013-06-16
Abstract
Abstract A film cassette comprises a rotatable film spool, a light shield for preventing ambient light from entering the cassette interior, and a locking pawl movable into engagement with the spool to inhibit rotation of the spool but being forced out of engagement with the spool when the spool is rotated. According to the invention, the light shield is movable to open and the locking pawl is arranged to move the light shield to open responsive to the locking pawl being forced out of engagement with the spool when the spool is rotated.
Inventors
- 👤 Anthony DiRisio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:22
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30; G03B2217/00; G03B2217/26; G03B2217/261; G03B2217/265
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A film cassette comprising a rotatable film spool, a light shield for preventing ambient light from entering the cassette, and a locking pawl movable into engagement with said spool to inhibit rotation of said spool but being forced out of engagement with said spool when said spool is rotated in a film unwinding direction, is characterized in that: said light shield is movable to open; and said locking pawl is arranged to move said light shield to open responsive to said locking pawl being forced out of engagement with said spool when said spool is rotated in the film unwinding direction.
Claim 2
Dependent Claim
101 words
A film cassette comprising a rotatable film spool, a light shield for preventing ambient light from entering the cassette, and a locking pawl movable into engagement with said spool to inhibit rotation of said spool but being forced out of engagement with said spool when said spool is rotated in a film unwinding direction, is characterized in that: said light shield is movable to open; and said locking pawl is arranged to move said light shield to open responsive to said locking pawl being forced out of engagement with said spool when said spool is rotated in the film unwinding direction.
Claim 3
Dependent Claim
64 words
A film cassette as recited in claim 1, wherein said locking pawl includes resilient means for first being temporarily deformed due to said locking pawl being forced out of engagement with said spool when said spool is rotated in the film unwinding direction and then automatically recovering its shape to change the position of said locking pawl to move said light shield to open.
Claim 4
Dependent Claim
94 words
A film cassette as recited in claim 1, wherein said locking pawl is a lever including an end portion held in motion transmitting relation with said light shield, a locking piece configured to engage said spool to inhibit rotation of said spool, and resilient means for first being temporarily deformed due to said locking piece being forced out of engagement with said spool when said spool is rotated in the film unwinding direction and then automatically recovering its shape to change the position of said end portion to move said light shield to open.
Claim 5
Dependent Claim
30 words
A film cassette as recited in claim 1, wherein said resilient means is a pair of longitudinal edge portions of said lever separated by a longitudinal hole in the lever.
Claim 6
Dependent Claim
131 words
A film cassette comprising a rotatable film spool, a light shield for preventing ambient light from entering the cassette, and a locking pawl movable into engagement with said spool to inhibit rotation of the spool but being forced out of engagement with said spool when said spool is rotated in a film unwinding direction, is characterized in that: said light shield is movable to open and to close; and said locking pawl is arranged in contact with said light shield to move said light shield to open responsive to said locking pawl being forced out of engagement with said spool when said spool is rotated in the film unwinding direction and to be moved by said light shield to re-engage said spool responsive to said light shield being moved to close.
Claim 7
Dependent Claim
131 words
A film cassette comprising a rotatable film spool, a light shield for preventing ambient light from entering the cassette, and a locking pawl movable into engagement with said spool to inhibit rotation of the spool but being forced out of engagement with said spool when said spool is rotated in a film unwinding direction, is characterized in that: said light shield is movable to open and to close; and said locking pawl is arranged in contact with said light shield to move said light shield to open responsive to said locking pawl being forced out of engagement with said spool when said spool is rotated in the film unwinding direction and to be moved by said light shield to re-engage said spool responsive to said light shield being moved to close.
Claim 8
Dependent Claim
60 words
A film cassette comprising a light shield for preventing ambient light from entering the cassette, is characterized in that: said light shield is movable to open; and over-center spring means is in contact with said light shield for first being temporarily deformed without opening said light shield and then automatically recovering its shape to move said light shield to open.
Claim 9
Dependent Claim
60 words
A film cassette comprising a light shield for preventing ambient light from entering the cassette, is characterized in that: said light shield is movable to open; and over-center spring means is in contact with said light shield for first being temporarily deformed without opening said light shield and then automatically recovering its shape to move said light shield to open.
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) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |