US3817103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copier test sheet
Assignee: Diamond Research Corp
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Filing: 1970-02-04
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Granted: 1974-06-18
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Expires: 1990-02-04
Abstract
Abstract A copier test sheet and method for determining the copy sheet temperature of document copying machines, which comprises a sheet of paper to be fed through the copier, the sheet having a plurality of separate and distinct patches or coating of temperature-sensitive material thereon, each patch or area being sensitized to a distinct and different temperature level, covering increments across a temperature operating range which copy sheets will be subjected to in a copier, such that when the sheet is fed through the copier there will be a change in the color or physical condition of those patches or areas whose sensitivity lies either at or below the actual temperature that the paper encountered.
Inventors
- 👤 A Diamond
- 👤 C Usedom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:18
CPC Classifications
G; G03; G03G; G03G5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
209 words
A method of determining the maximum temperature a copy sheet is subjected to in a copying machine having a prescribed ''''feed direction'''' for processing sheets therethrough, said method comprising: providing test sheets having individual temperature sensitive patches thereon which have differing critical temperatures covering an operating range for a copying machine, said sheets being arranged so that said patches are spatially disposed along a reference line disposed at about 45* with respect to said feed direction, with the patches being arranged in order of increasing critical temperature starting with the patch having the lowest critical temperature and ending with the patch having the highest critical temperature, feeding two of said test sheets separately through the said copying machine along said feed direction and subjecting them to the operating temperature in the machine, said sheets being fed through said machine such that the patch having the lowest critical temperature on one sheet will first encounter a heated region of said machine, while on the second sheet the patch having the highest critical temperature will first encounter the heated region; and removing said test sheets from said copier whereby a change in appearance of said patches upon reaching their critical temperature indicates the maximum temperature the sheet encountered in said machine.
Claim 2
Independent Claim
209 words
A method of determining the maximum temperature a copy sheet is subjected to in a copying machine having a prescribed ''''feed direction'''' for processing sheets therethrough, said method comprising: providing test sheets having individual temperature sensitive patches thereon which have differing critical temperatures covering an operating range for a copying machine, said sheets being arranged so that said patches are spatially disposed along a reference line disposed at about 45* with respect to said feed direction, with the patches being arranged in order of increasing critical temperature starting with the patch having the lowest critical temperature and ending with the patch having the highest critical temperature, feeding two of said test sheets separately through the said copying machine along said feed direction and subjecting them to the operating temperature in the machine, said sheets being fed through said machine such that the patch having the lowest critical temperature on one sheet will first encounter a heated region of said machine, while on the second sheet the patch having the highest critical temperature will first encounter the heated region; and removing said test sheets from said copier whereby a change in appearance of said patches upon reaching their critical temperature indicates the maximum temperature the sheet encountered in said machine.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |