US2581913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of making stannous salts of polyhydroxy aromatic compounds
Assignee: Bridgestone Firestone Inc
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Filing: 1948-05-22
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Granted: 1952-01-08
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Expires: 1968-05-22
Abstract
No abstract record available.
Inventors
- 👤 Jr George E P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:07
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/64; C07C37/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE PROCESS OF PRODUCING THE NORMAL STANNOUS SALT OF A COMPOUND OF THE CLASS CONSISTING OF CATECHOL AND HYDROCARBON-SUBSTITUTED CATECHOLS WHICH COMPRISES DISSOLVING THE COMPOUND AND STANNOUS SALT OF A MINERAL ACID IN A NON-ACID, INERT SOLVENT IN WHICH THE FIRST SALT IS INSOLUBLE, AND THEN ADDING ALKALI SO AS TO FORM AND PRECIPITATE THE SALT, THE REACTANTS BEING USED IN THE RATIO OF TWO MOLECULAR PROPORTIONS OF ALKALI FOR ONE MOLECULAR PROPORTION OF CATECHOL AND ONE MOLECULAR PROPORTION OF THE STANNOUS SALT.
Claim 2
Dependent Claim
83 words
THE PROCESS OF PRODUCING THE NORMAL STANNOUS SALT OF A COMPOUND OF THE CLASS CONSISTING OF CATECHOL AND HYDROCARBON-SUBSTITUTED CATECHOLS WHICH COMPRISES DISSOLVING THE COMPOUND AND STANNOUS SALT OF A MINERAL ACID IN A NON-ACID, INERT SOLVENT IN WHICH THE FIRST SALT IS INSOLUBLE, AND THEN ADDING ALKALI SO AS TO FORM AND PRECIPITATE THE SALT, THE REACTANTS BEING USED IN THE RATIO OF TWO MOLECULAR PROPORTIONS OF ALKALI FOR ONE MOLECULAR PROPORTION OF CATECHOL AND ONE MOLECULAR PROPORTION OF THE STANNOUS SALT.
References Cited (Backward Citations)
US2514180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |