Patent US2267444A successfully refreshed from Google Patents.
Patent US3311571A successfully refreshed from Google Patents.
US3311571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infusible silazane polymer and process for producing same
Assignee: Southern Research Institute
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Filing: 1965-08-30
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Granted: 1967-03-28
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Expires: 1985-08-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert E Burks
- 👤 Robert E Lacey
- 👤 Jr Charles L Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:48
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C08G77/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
THE PROCESS OF PRODUCING AN INFUSIBLE SILAZANE POLYMER HAVING IMPROVED THERMAL AND CHEMCIAL STABILITY FROM DIPHENYLDICHLOROSILANE WHICH COMPRISES: (A) REACTING DIPHENYLDICHLOROSILIANE IN THE PRESENCE OF TRIETHYLAMINE WITH A NITROGEN CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND METHYLAMINE TO FORM A POLYMERIC, NON-CRYSTALLINE REACTION PRODUCT AND (B) HEATING SAID NON-CRYSTALLINE REACTION PRODUCT IN A REACTION ZONE OPEN TO THE ATMOSHPER AT A TEMPERATURE RANGING FROM APPROXIMATELY 250*C. TO 450*C. UNTIL THE INFUSIBLE POLYMER IS FORMED.
Claim 2
Dependent Claim
77 words
THE PROCESS OF PRODUCING AN INFUSIBLE SILAZANE POLYMER HAVING IMPROVED THERMAL AND CHEMCIAL STABILITY FROM DIPHENYLDICHLOROSILANE WHICH COMPRISES: (A) REACTING DIPHENYLDICHLOROSILIANE IN THE PRESENCE OF TRIETHYLAMINE WITH A NITROGEN CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND METHYLAMINE TO FORM A POLYMERIC, NON-CRYSTALLINE REACTION PRODUCT AND (B) HEATING SAID NON-CRYSTALLINE REACTION PRODUCT IN A REACTION ZONE OPEN TO THE ATMOSHPER AT A TEMPERATURE RANGING FROM APPROXIMATELY 250*C. TO 450*C. UNTIL THE INFUSIBLE POLYMER IS FORMED.
Claim 3
Dependent Claim
62 words
A COMPOSITION COMPRISING AN INFUSILBE SILAZANE POLYMER RESULTING FROM HEATING IN A REACTION ZONE OPEN TO THE ATMOSPHERE AT A TEMPERATURE RANGING FROM APPROXIMATELY 250*C. TO 450C. UNTIL THE INFUSIBLE POYLMER IS FORMED THE POLYMERIC, NON-CRYSTALLINE, LOW MOLECULAR WEIGHT, REACTION PRODUCTS OF DIPHENYLDICHLOROSILANE WITH A NITROGEN CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND METHYLAMINE IN THE PRESENCE OF TRIETHYLAMINE.
Claim 4
Dependent Claim
62 words
A COMPOSITION COMPRISING AN INFUSILBE SILAZANE POLYMER RESULTING FROM HEATING IN A REACTION ZONE OPEN TO THE ATMOSPHERE AT A TEMPERATURE RANGING FROM APPROXIMATELY 250*C. TO 450C. UNTIL THE INFUSIBLE POYLMER IS FORMED THE POLYMERIC, NON-CRYSTALLINE, LOW MOLECULAR WEIGHT, REACTION PRODUCTS OF DIPHENYLDICHLOROSILANE WITH A NITROGEN CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND METHYLAMINE IN THE PRESENCE OF TRIETHYLAMINE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |