US3579271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring coating weight by using strontium as a tracer
Assignee: EIDP Inc
•
Filing: 1968-03-18
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Granted: 1971-05-18
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Expires: 1988-03-18
Abstract
Abstract A process of measuring the dry coating weight of a gelatin coating by adding a given amount of strontium to the coating solution before coating, then analyzing the dried coating to determine the amount of strontium present, thereby, indicating the coating weight.
Inventors
- 👤 Marc Paul Pomerantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/74; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A method of determining the dry coating weight of a layer of a photographic element having a support which comprises a. adding a known quantity of a strontium salt, strontium hydroxide or a strontium oxide that does not effect the photographic properties of said element to a known quantity of a coating solution. b. applying said strontium carrying coating solution to a support, c. dryinG said coating solution on said support, d. measuring the quantity of strontium present in the dry layer, the element having no other layer containing strontium at the time the measurement is made, and e. comparing the measured quantity of the strontium compound with a standard graph of a series of samples of coatings of different thicknesses containing measured known quantities of the strontium compound. The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
Claim 2
Dependent Claim
14 words
A method as in claim 1 where said coating solution is a gelatin solution.
Claim 3
Dependent Claim
24 words
A method as in claim 2 where strontium is added in amounts of 0.045 to 0.120 mole of strontium per 200 grams of gelatin.
Claim 4
Dependent Claim
14 words
A method as in claim 2 where said support is a photographic film base.
Claim 5
Dependent Claim
134 words
In a method for determining the dry coating weight of a nonlight-sensitive layer of a photographic element by coating a support with a light-sensitive silver halide layer and at least one nonlight-sensitive layer and measuring the weight of said nonlight-sensitive layer, the improvement of forming said nonlight-sensitive layer from a composition containing a known quantity of a strontium salt, strontium hydroxide or strontium oxide that does not effect the photographic properties of the silver halide and a known quantity of a coating solution, drying the formed layer, and measuring the quantity of strontium present by X-ray spectographic analysis, the photographic element having no other layer containing strontium, and comparing the measured quantity with a standard graph of a series of samples of coatings of different thicknesses containing measured known quantities of the strontium compound.
Claim 6
Dependent Claim
134 words
In a method for determining the dry coating weight of a nonlight-sensitive layer of a photographic element by coating a support with a light-sensitive silver halide layer and at least one nonlight-sensitive layer and measuring the weight of said nonlight-sensitive layer, the improvement of forming said nonlight-sensitive layer from a composition containing a known quantity of a strontium salt, strontium hydroxide or strontium oxide that does not effect the photographic properties of the silver halide and a known quantity of a coating solution, drying the formed layer, and measuring the quantity of strontium present by X-ray spectographic analysis, the photographic element having no other layer containing strontium, and comparing the measured quantity with a standard graph of a series of samples of coatings of different thicknesses containing measured known quantities of the strontium compound.
Claim 7
Dependent Claim
24 words
A method as in claim 5 where strontium is added in amounts of 0.045 to 0.120 mole of strontium per 200 grams of gelatin.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |