US2928857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selected tetrasubstituted monosilanes
Assignee: EIDP Inc
•
Filing: 1955-08-22
•
Granted: 1960-03-15
•
Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 Harold S Holt
- 👤 Walker Isaac Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:39
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A TETRASUBSITUTED MONOSILANE, THE SUBSTITUENTS BEING HYDROCARBON GROUPS FREE FROM NONBENZENOID UNSATURATION AND POLYFLUROALKOXY GROUPS OF THE FORMULA H(CF2)NCH2O-, WHERE N IS AN EVEN POSITIVE INTEGER OF 4 TO 8, INCLUSIVE, THERE BEING AT LEAST ONE EACH OF SAID HYDROCARBON AND SAID POLYFLUOROALKOXY GROUPS.
Claim 2
Dependent Claim
44 words
A TETRASUBSITUTED MONOSILANE, THE SUBSTITUENTS BEING HYDROCARBON GROUPS FREE FROM NONBENZENOID UNSATURATION AND POLYFLUROALKOXY GROUPS OF THE FORMULA H(CF2)NCH2O-, WHERE N IS AN EVEN POSITIVE INTEGER OF 4 TO 8, INCLUSIVE, THERE BEING AT LEAST ONE EACH OF SAID HYDROCARBON AND SAID POLYFLUOROALKOXY GROUPS.
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) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |