Patent US2521672A successfully refreshed from Google Patents.
US2521672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic curing of organo-siloxane resins
Assignee: Dow Chemical Co
•
Filing: 1946-04-29
•
Granted: 1950-09-12
•
Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 Luther F Berhenke
- 👤 Laurence W Byers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:31
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE PROCESS WHICH COMPRISES HEAT-CURING, IN THE ABSENCE OF OTHR CURABLE ORGANIC MATERIALS, A BENZENE-SOLUBLE ORGANO-SILOXANE POLYMER CONTAINING IN THE MOLECULE THE STRUCTURAL UNITS, (RSIO1.5) AND (R''R"SIO) IN WHICH R, R'', AND R" ARE MONOVALENT HYDROCARBON RADICALS, AND FROM 55 TO 67 PER CENT OF THE TOTAL NUMBER OF SAID STRUCTURAL UNITS ARE THE UNITS (RSIO1.5), IN ADMIXTURE WITH A PAINT DRIER SELECTED FROM THE GROUP CONSISTING OF COBALT MANGANESE, ZINC AND CALCIUM COMPOUNDS WHICH ARE SOLUBLE IN A SOLVENT OF THE GROUP CONSISTING OF TURPENTINE AND MINERAL SPIRITS.
Claim 2
Dependent Claim
89 words
THE PROCESS WHICH COMPRISES HEAT-CURING, IN THE ABSENCE OF OTHR CURABLE ORGANIC MATERIALS, A BENZENE-SOLUBLE ORGANO-SILOXANE POLYMER CONTAINING IN THE MOLECULE THE STRUCTURAL UNITS, (RSIO1.5) AND (R''R"SIO) IN WHICH R, R'', AND R" ARE MONOVALENT HYDROCARBON RADICALS, AND FROM 55 TO 67 PER CENT OF THE TOTAL NUMBER OF SAID STRUCTURAL UNITS ARE THE UNITS (RSIO1.5), IN ADMIXTURE WITH A PAINT DRIER SELECTED FROM THE GROUP CONSISTING OF COBALT MANGANESE, ZINC AND CALCIUM COMPOUNDS WHICH ARE SOLUBLE IN A SOLVENT OF THE GROUP CONSISTING OF TURPENTINE AND MINERAL SPIRITS.
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) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |