Patent US3216979A successfully refreshed from Google Patents.
US3216979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer composed of sulfonium salts
Assignee: Wyeth Holdings LLC
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Filing: 1961-03-09
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Granted: 1965-11-09
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Expires: 1981-03-09
Abstract
No abstract record available.
Inventors
- 👤 David R Sexsmith
- 👤 Everett J Frazza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:18
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A WATER-SOLUBLE COPOLYMERIC COMPOSITION CONSISTING ESSENTIALLY OF RECURRING UNITS OF THE FORMULA
Claim 2
Dependent Claim
12 words
A WATER-SOLUBLE COPOLYMERIC COMPOSITION CONSISTING ESSENTIALLY OF RECURRING UNITS OF THE FORMULA
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |