Patent US2820798A successfully refreshed from Google Patents.
US2820798A
Expired / Lapsed
US
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Copolymers of organic silicon compounds and n-vinyl pyrrolidone
Assignee: Union Carbide Corp
•
Filing: 1956-03-27
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Granted: 1958-01-21
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Expires: 1976-03-27
Abstract
No abstract record available.
Inventors
- 👤 Donald L Bailey
- 👤 Ronald M Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:03
CPC Classifications
C; C08; C08F; C08F230/00; C08F230/04; C08F230/08; C08F230/085; Y; Y10; Y10S; Y10S516/00; Y10S516/905; Y10S516/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A COPOLYMER OF N-VINYL PYRROLIDONE AND TRIMETHYLSILOXYDIMETHYLVINYLSILANE.
Claim 2
Dependent Claim
7 words
A COPOLYMER OF N-VINYL PYRROLIDONE AND TRIMETHYLSILOXYDIMETHYLVINYLSILANE.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |