US2592366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noncaking photographic acid fixing powders
Assignee: Eastman Kodak Co
•
Filing: 1951-02-09
•
Granted: 1952-04-08
•
Expires: 1971-02-09
Abstract
No abstract record available.
Inventors
- 👤 Edwin S Wiitala
- 👤 Donald J Kridel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:53
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/386
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A NON-CAKING ACID FIXING POWDER COMPOSITION CONTAINING SODIUM THIOSULFATE, AN ALKALI SULFITE, A HARDENING AGENT, BORIC ANHYDRIDE, AND A SALT OF A SOLID ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF ACETIC, CITRIC AND TARTARIC ACIDS.
Claim 2
Dependent Claim
36 words
A NON-CAKING ACID FIXING POWDER COMPOSITION CONTAINING SODIUM THIOSULFATE, AN ALKALI SULFITE, A HARDENING AGENT, BORIC ANHYDRIDE, AND A SALT OF A SOLID ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF ACETIC, CITRIC AND TARTARIC ACIDS.
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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |