Patent US5477289A successfully refreshed from Google Patents.
US5477289A
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Camera including multiple burst data to identify unexposed frames
Assignee: Eastman Kodak Co
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Filing: 1994-03-25
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Granted: 1995-12-19
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Expires: 2014-03-25
Abstract
Abstract A camera of the prewind or normal wind type that writes data on a roll of film to indicate where specific frames on the roll of film have been exposed and unexposed and detects the presence of that data on the film to determine where additional exposures may be made on the roll of film. The camera writes data on the magnetically sensitive layer of the roll of film in bursts, wherein each burst is separated from each other burst with nonwritten portions of film. BY using one pattern of data and spaces for the marking of exposed frames and another pattern for unexposed frames, prewind and normal wind cameras can interchange partially exposed rolls of film without explicitly decoding magnetic data.
Inventors
- 👤 David C. Smart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:09
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/24; G03B2217/00; G03B2217/24; G03B2217/242; G03B2217/244; G03B2217/246
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A camera comprising: means for imaging scene light onto a roll of film contained in the camera when a photograph is taken; and recording device means for writing data on the roll of film contained in the camera when a photograph is taken to indicate that a photograph has been taken; wherein the recording device means writes different data on the roll of film corresponding to each unexposed frame of film to indicate that specific frames on the roll of film have not been exposed; and wherein the recording device means writes continuous data to indicate an exposed frame on the roll of film and writes multiple separated bursts of data to indicate frames on the roll of film that have not been exposed.
Claim 2
Dependent Claim
124 words
A camera comprising: means for imaging scene light onto a roll of film contained in the camera when a photograph is taken; and recording device means for writing data on the roll of film contained in the camera when a photograph is taken to indicate that a photograph has been taken; wherein the recording device means writes different data on the roll of film corresponding to each unexposed frame of film to indicate that specific frames on the roll of film have not been exposed; and wherein the recording device means writes continuous data to indicate an exposed frame on the roll of film and writes multiple separated bursts of data to indicate frames on the roll of film that have not been exposed.
Claim 3
Dependent Claim
45 words
The camera claimed in claim 1, wherein the recording device means writes the continuous data in the vicinity of the exposed frame to indicate a photographic exposure and writes the separated bursts of data in the vicinity of the frames that have not been exposed.
Claim 4
Dependent Claim
148 words
A camera having a mid-roll interrupt and a reading means for reading data and a writing means for writing data, is characterized by: the writing means writes data on a roll of film contained in the camera when a photograph is taken to indicate that a photograph has been taken, the writing means writes different data on the roll of film corresponding to each unexposed frame of film when the mid-roll interrupt is activated to indicate that specific frames on the roll of film have not been exposed and the reading means detects the data written on the roll of film to determine whether or not individual exposures have been made; wherein the writing means writes continuous data to indicate an exposed frame on the roll of film and writes multiple separated bursts of data to indicate frames on the roll of film that have not been exposed.
Claim 5
Dependent Claim
148 words
A camera having a mid-roll interrupt and a reading means for reading data and a writing means for writing data, is characterized by: the writing means writes data on a roll of film contained in the camera when a photograph is taken to indicate that a photograph has been taken, the writing means writes different data on the roll of film corresponding to each unexposed frame of film when the mid-roll interrupt is activated to indicate that specific frames on the roll of film have not been exposed and the reading means detects the data written on the roll of film to determine whether or not individual exposures have been made; wherein the writing means writes continuous data to indicate an exposed frame on the roll of film and writes multiple separated bursts of data to indicate frames on the roll of film that have not been exposed.
Claim 6
Dependent Claim
43 words
The camera claimed in claim 3, wherein the writing means writes the continuous data in the vicinity of the exposed frame to indicate a photographic exposure and writes the separated bursts of data in the vicinity of frames that have not been exposed.
Claim 7
Dependent Claim
94 words
A normal wind mid-roll interrupt camera having a mid-roll interrupt and a means for reading data and a means for writing data, is characterized by: the writing means writes continuous data on a roll of film contained in the camera when a photograph is taken to indicate that a photograph has been taken, and the reading means detects the continuous data indicating that a photograph has been taken as well as detecting multiple separated bursts of data written by a prewind camera to determine if exposures have been made on the roll of film.
Claim 8
Dependent Claim
94 words
A normal wind mid-roll interrupt camera having a mid-roll interrupt and a means for reading data and a means for writing data, is characterized by: the writing means writes continuous data on a roll of film contained in the camera when a photograph is taken to indicate that a photograph has been taken, and the reading means detects the continuous data indicating that a photograph has been taken as well as detecting multiple separated bursts of data written by a prewind camera to determine if exposures have been made on the roll of film.
Claim 9
Dependent Claim
25 words
The camera claimed in claim 5, wherein the writing means writes the continuous data in the vicinity of the exposed frame to indicate photographic exposure.
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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) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |