US3276874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer starter solutions
Assignee: Eastman Kodak Co
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Filing: 1963-04-23
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Granted: 1966-10-04
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Expires: 1983-04-23
Abstract
No abstract record available.
Inventors
- 👤 Gerald I P Levenson
- 👤 Clifford J Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:14
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/266; G03C5/29; G03C5/31; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A METHOD OF MAKING A PHTOGRAPHIC SILVER HALIDE DEVELOPING BATH WHICH COMPRISES THE STEP OF MIXING A DEVELOPER REPLENSIHER SOLUTION COMPRISING: 1-PHENYL-3-PYRAZOLIDONE G 10 HYDROQUINOSE G 300 BORAX G 160 POTASSIUM HYDROXIDE G 840 POTASSIUM METABISULPHITE G 1060 POTASSIUM BROMIDE G 20 WATER TO 5 1. WATER TO 5 1. WITH A STARTER SOLUTION WHICH CONTAINS ACID AND BROMIDE ION, THE IMPROVEMENT WHEREIN THE SOLE ACID INGREDIENT OF SAID STARTER SOLUTION CONTAINS HYDROGEN BROMIDE AT A CONCENTRATION OF AT LEAST 5 PERCENT BY WEIGHT OF SAID STARTER SOLUTION.
Claim 2
Dependent Claim
89 words
IN A METHOD OF MAKING A PHTOGRAPHIC SILVER HALIDE DEVELOPING BATH WHICH COMPRISES THE STEP OF MIXING A DEVELOPER REPLENSIHER SOLUTION COMPRISING: 1-PHENYL-3-PYRAZOLIDONE G 10 HYDROQUINOSE G 300 BORAX G 160 POTASSIUM HYDROXIDE G 840 POTASSIUM METABISULPHITE G 1060 POTASSIUM BROMIDE G 20 WATER TO 5 1. WATER TO 5 1. WITH A STARTER SOLUTION WHICH CONTAINS ACID AND BROMIDE ION, THE IMPROVEMENT WHEREIN THE SOLE ACID INGREDIENT OF SAID STARTER SOLUTION CONTAINS HYDROGEN BROMIDE AT A CONCENTRATION OF AT LEAST 5 PERCENT BY WEIGHT OF SAID STARTER SOLUTION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |