Patent US2098642A successfully refreshed from Google Patents.
Patent US3197451A successfully refreshed from Google Patents.
US3197451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of fluorinated nitrosoalkanes and trifluoroethylene
Assignee: National Research Development Corp UK
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Filing: 1961-07-11
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Granted: 1965-07-27
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Expires: 1981-07-11
Abstract
No abstract record available.
Inventors
- 👤 Haszeldine Robert Neville
- 👤 Christopher J Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:32
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A SUBSTANTIALLY 1:1 COPOLYMER OF TRIFLUOROETHYLENE AND A FLUORINATED NITROSOALKANE, SAID COPOLYMER CONSISTING ESSENTIALLY OF STRUCTURAL UNITS, CONNECTED IN HEAD TO TAIL MANNER, OF THE FORMULA
Claim 2
Dependent Claim
26 words
A SUBSTANTIALLY 1:1 COPOLYMER OF TRIFLUOROETHYLENE AND A FLUORINATED NITROSOALKANE, SAID COPOLYMER CONSISTING ESSENTIALLY OF STRUCTURAL UNITS, CONNECTED IN HEAD TO TAIL MANNER, OF THE FORMULA
References Cited (Backward Citations)
FR1159935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |