US2548552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidifying compound for photographic baths
Assignee: Eastman Kodak Co
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Filing: 1947-10-04
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Granted: 1951-04-10
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Expires: 1967-10-04
Abstract
No abstract record available.
Inventors
- 👤 Lowell E Muehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:22
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/386
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A DRY, PACKAGED PHOTOGRAPHIC COMPOSITION ADAPTED TO FORM AN ACID HARDENING FIXING BATH WHEN MIXED IN AQUEOUS SOLUTION WITH A FIXING AGENT, A SOLUBLE SULFITE, AND A SALT OF AN ALIPHATIC ACID CONTAINING TWO TO FOUR CARBON ATOMS, WHICH COMPOSITION COMPRISES APPROXIMATELY ONE PART OF POTASSIUM ALUM AND APPROXIMATELY TWO PARTS OF POTASSIUM PYROSULFATE AS THE GENERATOR OF FREE ALIPHATIC ACID BY REACTION WITH THE SALT THEREOF.
Claim 2
Dependent Claim
67 words
A DRY, PACKAGED PHOTOGRAPHIC COMPOSITION ADAPTED TO FORM AN ACID HARDENING FIXING BATH WHEN MIXED IN AQUEOUS SOLUTION WITH A FIXING AGENT, A SOLUBLE SULFITE, AND A SALT OF AN ALIPHATIC ACID CONTAINING TWO TO FOUR CARBON ATOMS, WHICH COMPOSITION COMPRISES APPROXIMATELY ONE PART OF POTASSIUM ALUM AND APPROXIMATELY TWO PARTS OF POTASSIUM PYROSULFATE AS THE GENERATOR OF FREE ALIPHATIC ACID BY REACTION WITH THE SALT THEREOF.
References Cited (Backward Citations)
US2378248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |