Patent US3888875A successfully refreshed from Google Patents.
US3888875A
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Novel processes for photographic products
Assignee: Polaroid Corp
•
Filing: 1973-08-29
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Granted: 1975-06-10
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Expires: 1993-08-29
Abstract
Abstract An improved process for producing metallized dye developers useful in photographic products.
Inventors
- 👤 Henry Bader
- 👤 Donald O Rickter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:23
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/08; C09B47/24; C09B47/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
13 words
IN A PROCESS COMPRISING THE STEP OF REACTING A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
13 words
IN A PROCESS COMPRISING THE STEP OF REACTING A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
16 words
A process of claim 1 wherein said medium comprises a mixture of water and methylene chloride.
Claim 4
Dependent Claim
29 words
A process oF claim 1 wherein said acid neutralizing reagent comprises an alkali metal hydroxide, or an alkali metal carbonate or an alkali metal bicarbonate or mixtures of these.
Claim 5
Dependent Claim
14 words
A process of claim 1 wherein each R is -CH3 and each R1 is
Claim 6
Dependent Claim
20 words
A process of claim 1 wherein said medium comprises from about 5 to about 50% by volume of methylene chloride.
Claim 7
Dependent Claim
9 words
A process of claim 1 wherein M is copper.
Claim 8
Dependent Claim
15 words
A process which comprises the steps of: Step 1. reacting a compound of the formula:
Claim 9
Dependent Claim
15 words
A process which comprises the steps of: Step 1. reacting a compound of the formula:
Claim 10
Dependent Claim
17 words
A process of claim 7 wherein said aqueous medium comprises a mixture of water and methylene chloride.
Claim 11
Dependent Claim
29 words
A process of claim 7 wherein said acid neutralizing reagent comprises an alkali metal hydroxide, or an alkali metal carbonate or an alkali metal bicarbonate or mixtures of these.
Claim 12
Dependent Claim
14 words
A process of claim 7 wherein each R is -CH3 and each R1 is
Claim 13
Dependent Claim
21 words
A process of claim 7 wherein said aqueous medium comprises from about 5 to about 50% by volume of methylene chloride.
Claim 14
Dependent Claim
9 words
A process of claim 7 wherein M is copper.
References Cited (Backward Citations)
US3349097A
Cited
US3737437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |