US4740074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film development system
Assignee: Individual
•
Filing: 1987-10-30
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Granted: 1988-04-26
•
Expires: 2007-10-30
Abstract
Abstract A film development system including a container for development fluid, a lid for the container, a computer, a temperature sensing probe and a visual time display. The temperature sensing probe extends downwardly into the container and monitors the temperature of a development fluid therein. The temperature probe transmits data to the computer which is adapted to calculate the time remaining for a selected film development step corresponding to the temperature indicated by the temperature probe. The computer transmits signals to the visual display where the temperature of the development fluid and the time remaining until completion of the film development step are displayed.
Inventors
- 👤 Charles S. Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:37
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/006; G03D13/02; G03D13/04; G03D13/043
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
135 words
A portable film development tank of the type having a container for development fluids, a film-retaining spool member removably positioned within said container, and a removable lid, wherein the improvement comprises providing: temperature sensing means extending into said container for sensing the temperature of a development fluid therein; computer means electrically connected to said temperature sensing means for receiving signals corresponding to the temperature of the development fluid from said temperature sensing means and adapted to be programmed to determine the time required to complete a selected film processing step as a function of said development fluid temperature; display means electrically connected to said computer means for receiving time data signals from said computer means and displaying said time data; and power source means electrically associated with said computer means for providing electrical power thereto.
Claim 2
Dependent Claim
135 words
A portable film development tank of the type having a container for development fluids, a film-retaining spool member removably positioned within said container, and a removable lid, wherein the improvement comprises providing: temperature sensing means extending into said container for sensing the temperature of a development fluid therein; computer means electrically connected to said temperature sensing means for receiving signals corresponding to the temperature of the development fluid from said temperature sensing means and adapted to be programmed to determine the time required to complete a selected film processing step as a function of said development fluid temperature; display means electrically connected to said computer means for receiving time data signals from said computer means and displaying said time data; and power source means electrically associated with said computer means for providing electrical power thereto.
Claim 3
Dependent Claim
18 words
A portable film development tank according to claim 1 wherein the temperature sensing means includes a temperature probe.
Claim 4
Dependent Claim
23 words
A portable film development tank according to claim 2 wherein the temperature sensing means includes a thermistor electrically connected to said temperature probe.
Claim 5
Dependent Claim
16 words
A portable film development tank according to claim 1 wherein the computer means is a microprocessor.
Claim 6
Dependent Claim
18 words
A portable film development tank according to claim 4 including a timing means electrically connected to said microprocessor.
Claim 7
Dependent Claim
19 words
A portable film development tank according to claim 1 wherein the display means is a liquid crystal display device.
Claim 8
Dependent Claim
17 words
A portable film development tank according to claim 1 wherein the power source means is a battery.
Claim 9
Dependent Claim
30 words
A portable film development tank according to claim 1 wherein the temperature sensing means, the computer means and the display means are secured to the lid of the development tank.
Claim 10
Dependent Claim
129 words
A portable film development tank comprising: a container for development fluids adapted to receive a removable film-retaining spool member; a lid removably secured to said container; temperature sensing means extending into said container for sensing the temperature of a development fluid therein; computer means electrically connected to said temperature sensing means for receiving signals corresponding to the temperature of the development fluid from said temperature sensing means and adapted to be programmed to determine the time required to complete a selected film processing step as a function of said development fluid temperature; display means electrically connected to said computer means for receiving time data signals from said computer means and displaying said time data; and power source means electrically associated with said computer means for providing electrical power thereto.
Claim 11
Dependent Claim
129 words
A portable film development tank comprising: a container for development fluids adapted to receive a removable film-retaining spool member; a lid removably secured to said container; temperature sensing means extending into said container for sensing the temperature of a development fluid therein; computer means electrically connected to said temperature sensing means for receiving signals corresponding to the temperature of the development fluid from said temperature sensing means and adapted to be programmed to determine the time required to complete a selected film processing step as a function of said development fluid temperature; display means electrically connected to said computer means for receiving time data signals from said computer means and displaying said time data; and power source means electrically associated with said computer means for providing electrical power thereto.
Claim 12
Dependent Claim
18 words
A portable film development tank according to claim 9 wherein the temperature sensing means includes a temperature probe.
Claim 13
Dependent Claim
23 words
A portable film development tank according to claim 10 wherein the temperature sensing means includes a thermistor electrically connected to said temperature probe.
Claim 14
Dependent Claim
16 words
A portable film development tank according to claim 9 wherein the computer means is a microprocessor.
Claim 15
Dependent Claim
18 words
A portable film development tank according to claim 12 including a timing means electrically connected to said microprocessor.
Claim 16
Dependent Claim
19 words
A portable film development tank according to claim 9 wherein the display means is a liquid crystal display device.
Claim 17
Dependent Claim
17 words
A portable film development tank according to claim 9 wherein the power source means is a battery.
Claim 18
Dependent Claim
30 words
A portable film development tank according to claim 9 wherein the temperature sensing means, the computer means and the display means are secured to the lid of the development tank.
Claim 19
Dependent Claim
133 words
A portable film development tank comprising: a container for development fluids adapted to receive a removable film-retaining spool member; a lid removably secured to said container; a temperature probe secured to said lid and extending generally downwardly into said container for sensing the temperature of a development fluid therein; a microprocessor electrically connected to said temperature probe for receiving signals corresponding to the temperature of the development fluid from said temperature probe and adapted to be programmed to determine the time required to complete a selected film processing step as a function of said development fluid temperature; a liquid crystal display device electrically connected to said microprocessor for receiving time data signals from said microprocessor and displaying said time data; and a battery electrically associated with said microprocessor for providing electrical power thereto.
Claim 20
Dependent Claim
133 words
A portable film development tank comprising: a container for development fluids adapted to receive a removable film-retaining spool member; a lid removably secured to said container; a temperature probe secured to said lid and extending generally downwardly into said container for sensing the temperature of a development fluid therein; a microprocessor electrically connected to said temperature probe for receiving signals corresponding to the temperature of the development fluid from said temperature probe and adapted to be programmed to determine the time required to complete a selected film processing step as a function of said development fluid temperature; a liquid crystal display device electrically connected to said microprocessor for receiving time data signals from said microprocessor and displaying said time data; and a battery electrically associated with said microprocessor for providing electrical power thereto.
Claim 21
Dependent Claim
27 words
A portable film development tank according to claim 17 wherein said temperature probe includes a thermistor electrically connected thereto and to which said microprocessor is electrically connected.
Claim 22
Dependent Claim
19 words
A portable film development tank according to claim 17 wherein said microprocessor includes a timing means electrically connected thereto.
Claim 23
Dependent Claim
17 words
A portable film development tank according to claim 19 wherein said timing means comprises a quartz clock.
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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) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |