Patent US2685513A successfully refreshed from Google Patents.
US2685513A
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US
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Method of stabilizing hydrates of sodium metaborate and single powder photographic developers containing same
Assignee: Eastman Kodak Co
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Filing: 1952-06-26
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Granted: 1954-08-03
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Expires: 1972-06-26
Abstract
No abstract record available.
Inventors
- 👤 Richard W Henn
- 👤 Arthur A Rasch
- 👤 John I Crabtree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:17
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; C01B35/08; C01B35/10; C01B35/12; G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE METHOD OF STABILIZING HYDRATES OF SODIUM METABORATE WHICH COMPRISES MIXING POWDER LIKE PARTICLES THEREOF WITH 2.5 TO 10% BY WEIGHT OF A FINELY DIVIDED STABLIZER SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ANHYDRIDE, BORIC ANHYDRIDE, AND METABORIC ACID AND HEATING THE MIXTURE FOR APPROXIMATELY 4 HOURS AT 70* C.
Claim 2
Independent Claim
50 words
THE METHOD OF STABILIZING HYDRATES OF SODIUM METABORATE WHICH COMPRISES MIXING POWDER LIKE PARTICLES THEREOF WITH 2.5 TO 10% BY WEIGHT OF A FINELY DIVIDED STABLIZER SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ANHYDRIDE, BORIC ANHYDRIDE, AND METABORIC ACID AND HEATING THE MIXTURE FOR APPROXIMATELY 4 HOURS AT 70* C.
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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |