Patent US2777870A successfully refreshed from Google Patents.
US2777870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine-containing siloxanes
Assignee: Purdue Research Foundation
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Filing: 1955-02-07
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Granted: 1957-01-15
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Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 Earl T Mcbee
- 👤 Ogden R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:32
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A POLYKIS LOWER-PERFLUOROALKYL SUBSTITUTED ALKOXY LOWER-SILOXANE HAVING NOT MORE THAN THREE SILICON ATOMS.
Claim 2
Dependent Claim
13 words
A POLYKIS LOWER-PERFLUOROALKYL SUBSTITUTED ALKOXY LOWER-SILOXANE HAVING NOT MORE THAN THREE SILICON ATOMS.
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) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |