US3245953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polymers containing a doubly bridged beryllium atom
Assignee: Pennwalt Corp
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Filing: 1963-06-14
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Granted: 1966-04-12
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Expires: 1983-06-14
Abstract
No abstract record available.
Inventors
- 👤 Block Burton Peter
- 👤 Charles W Schaumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:07
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE PROCESS OF MAKING A POLYMER HAVING AN INORGANIC BACKBONE CONSISTING OF A DOUBLY BRIDGED BERYLLIUM ATOM WHEREIN EACH OF SAID BRINGING GROUPS IS THE ANION OF AN ACID R2P(O)OH WHERE R IS SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON ALKYL, CYCLOALKYL AND ARYL GROUPS CONTAINING FROM ONE TO TWELVE CARBON ATOMS, WHICH COMPRISES HEATING A SOLID MIXTURE OF BERYLLIUM ACETYLACETONATE AND A MOLAR EXCESS OF A PHOSPHINIC ACID OF STRUCTURE R2P(O)OH AS DEFINED ABOVE AT A TEMPERATURE BETWEEN ABOUT 75* AND ABOUT 250*C. AT A PRESSURE BETWEEN ABOUT 0.05 MM. HG AND ABOUT 1 ATMOSPHERE, SAID PHOSPHINIC ACID BEING SUBSTANTIALLY NON-VOLATILE AT REACTION CONDITIONS.
Claim 2
Dependent Claim
105 words
THE PROCESS OF MAKING A POLYMER HAVING AN INORGANIC BACKBONE CONSISTING OF A DOUBLY BRIDGED BERYLLIUM ATOM WHEREIN EACH OF SAID BRINGING GROUPS IS THE ANION OF AN ACID R2P(O)OH WHERE R IS SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON ALKYL, CYCLOALKYL AND ARYL GROUPS CONTAINING FROM ONE TO TWELVE CARBON ATOMS, WHICH COMPRISES HEATING A SOLID MIXTURE OF BERYLLIUM ACETYLACETONATE AND A MOLAR EXCESS OF A PHOSPHINIC ACID OF STRUCTURE R2P(O)OH AS DEFINED ABOVE AT A TEMPERATURE BETWEEN ABOUT 75* AND ABOUT 250*C. AT A PRESSURE BETWEEN ABOUT 0.05 MM. HG AND ABOUT 1 ATMOSPHERE, SAID PHOSPHINIC ACID BEING SUBSTANTIALLY NON-VOLATILE AT REACTION CONDITIONS.
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |