Patent US4099976A successfully refreshed from Google Patents.
US4099976A
Expired / Lapsed
US
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Water-dispersible biodegradable compositions and containers and the like made therefrom
Assignee: Personal Products Co
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Filing: 1976-01-21
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Granted: 1978-07-11
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Expires: 1996-01-21
Abstract
Abstract A thermoplastic, water-dispersible, biodegradable composition of matter which is resistant to fungal attack prior to dispersal, and containers and the like made therefrom. The composition comprises hydroxyalkyl cellulose, starch, and a member selected from the group consisting of sorbic acid and its alkali metal salts as the anti-fungal agent. Only a member of this group is found to be an effective anti-fungal agent in the composition of the invention.
Inventors
- 👤 Kenneth S. Kraskin
- 👤 Mohamed W. Hammad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:20
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/02; A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/26; A61L; A61L15/00; A61L15/16; A61L15/20; A61L15/22; A61L15/225; A61L15/42; A61L15/46; C08K; C08K5/00; C08K5/04; C08K5/09; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284; A61L2300/00; A61L2300/40; A61L2300/404
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
46 words
A thermoplastic, water-dispersible, biodegradable composition of matter comprising hydroxyalkyl cellulose, starch, and an antimycotically-effective amount of a member selected from the group consisting of sorbic acid and its alkali metal salts, whereby the composition is biodegradable after disposal but resistant to fungal attack prior to dispersal.
Claim 2
Dependent Claim
46 words
A thermoplastic, water-dispersible, biodegradable composition of matter comprising hydroxyalkyl cellulose, starch, and an antimycotically-effective amount of a member selected from the group consisting of sorbic acid and its alkali metal salts, whereby the composition is biodegradable after disposal but resistant to fungal attack prior to dispersal.
Claim 3
Dependent Claim
27 words
A composition of matter as in claim 1 wherein the weight ratio of starch to hydroxyalkyl cellulose in the composition is from about 1.5 to about 2.5.
Claim 4
Dependent Claim
15 words
A composition of matter as in claim 1 wherein the hydroxyalkyl cellulose is hydroxypropyl cellulose.
Claim 5
Dependent Claim
56 words
A composition of matter as in claim 3 wherein the hydroxypropyl cellulose has a molecular weight of about 300,000 and a molar substitution of from about three to about five and the starch is corn starch, and wherein the weight ratio of starch to hydroxypropyl cellulose in the composition is from about 1.5 to about 2.5.
Claim 6
Dependent Claim
18 words
A composition of matter as in claim 2 which comprises at least about 0.1% by weight sorbic acid.
Claim 7
Dependent Claim
18 words
A composition of matter as in claim 2 which comprises at least about 0.2% by weight potassium sorbate.
Claim 8
Dependent Claim
18 words
A composition of matter as in claim 3 which comprises at least about 0.1% by weight sorbic acid.
Claim 9
Dependent Claim
18 words
A composition of matter as in claim 3 which comprises at least about 0.2% by weight potassium sorbate.
Claim 10
Dependent Claim
18 words
A composition of matter as in claim 4 which comprises at least about 0.1% by weight sorbic acid.
Claim 11
Dependent Claim
18 words
A composition of matter as in claim 4 which comprises at least about 0.2% by weight potassium sorbate.
Claim 12
Dependent Claim
19 words
A composition of matter as in claim 9 which further comprises a lubricant, an antioxidant, and an opacifying agent.
Claim 13
Dependent Claim
10 words
A container consisting essentially of the composition of claim 1.
Claim 14
Dependent Claim
10 words
A container consisting essentially of the composition of claim 4.
Claim 15
Dependent Claim
9 words
A container consisting essentially of the composition claim 9.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |