Patent US3300546A successfully refreshed from Google Patents.
US3300546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble envelope prepared from a graft polymer of alkyl acrylate on a polyvinyl alcohol/polyvinyl acetate co-polymer
Assignee: Wyeth Holdings LLC
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Filing: 1965-10-05
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Granted: 1967-01-24
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Expires: 1985-10-05
Abstract
No abstract record available.
Inventors
- 👤 Robert L Baechtold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
C; C08; C08F; C08F261/00; C08F261/02; C08F261/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A SEALED ENVELOPE COMPOSED OF A SELF-SUPPORTING FILM OF A DRY, WATER-SOLUBLE, WATER- AND HEAT-SEALABLE FILM OF A NORMALLY WATER-SOLUBLE LINEAR POLYMER SUBSTANTIALLY COMPOSED OF -CH2CH(OH)- AND -CH2CH(OOCCH3)LINKAGES IN MOLAR RATIO BETWEEN 95:5 AND 80:20 HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT BETWEEN 15,000 AND 150,000, TOUGHENED AND PERMANENTLY PLASTICIZED BY A MINOR GRAFTED CONTENT OF AN ESTER OF ACRYLIC ACID WITH AN ALIPHATIC ALCOHOL WHICH IS MORE THAN 5% SOLUBLE IN WATER AT 20*C.
Claim 2
Dependent Claim
74 words
A SEALED ENVELOPE COMPOSED OF A SELF-SUPPORTING FILM OF A DRY, WATER-SOLUBLE, WATER- AND HEAT-SEALABLE FILM OF A NORMALLY WATER-SOLUBLE LINEAR POLYMER SUBSTANTIALLY COMPOSED OF -CH2CH(OH)- AND -CH2CH(OOCCH3)LINKAGES IN MOLAR RATIO BETWEEN 95:5 AND 80:20 HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT BETWEEN 15,000 AND 150,000, TOUGHENED AND PERMANENTLY PLASTICIZED BY A MINOR GRAFTED CONTENT OF AN ESTER OF ACRYLIC ACID WITH AN ALIPHATIC ALCOHOL WHICH IS MORE THAN 5% SOLUBLE IN WATER AT 20*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |