Patent US3216579A successfully refreshed from Google Patents.
US3216579A
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Water-insoluble polyvinylpyrrolidone composition
Assignee: IND BIOLOGY LAB Inc
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Filing: 1961-05-25
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Granted: 1965-11-09
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Expires: 1981-05-25
Abstract
No abstract record available.
Inventors
- 👤 Morris V Shelanski
- 👤 Levenson Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:25
CPC Classifications
C; C12; C12H; C12H1/00; C12H1/02; C12H1/04; C08; C08K; C08K9/00; C08K9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A WATER-INSOLUBLE PRODUCT CONSISTING ESSENTIALLY OF POLYVINYLPYRROLIDONE ADSORBED ON GRANULAR, HYDRATED, SYNTHETIC CALCIUM SILICATE.
Claim 2
Dependent Claim
14 words
A WATER-INSOLUBLE PRODUCT CONSISTING ESSENTIALLY OF POLYVINYLPYRROLIDONE ADSORBED ON GRANULAR, HYDRATED, SYNTHETIC CALCIUM SILICATE.
References Cited (Backward Citations)
CA572682A
Cited
CA596585A
Cited
US2508602A
Cited
US2900305A
Cited
US2811449A
Cited
US3099626A
Cited
US3033648A
Cited
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 |