Patent US3457198A successfully refreshed from Google Patents.
US3457198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft polymerization of acrylic acidester mixtures to cellulose
Assignee: Rayonier Inc
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Filing: 1967-03-15
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Granted: 1969-07-22
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Expires: 1987-03-15
Abstract
No abstract record available.
Inventors
- 👤 Igor Sobolev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:49
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; C; C08; C08F; C08F251/00; C08F251/02; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2212; C08J2301/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE PROCESS FOR GRAFTING AN ACID MONOMER ONTO CELLULOSE TO FORM REACTION KPRODUCTS WHILE RETAINING THE GENERAL PHYSICAL STRUCTURE OR FORM OF THE UNTREATED CELLULOSE WHICH COMPRISES PROVIDING CELLULOSE HAVING REACTIVE SITES ALONG THE CELLULOSE CHAIN, TREATING THE CELLULOSE IN AN AQUEOUS ACID SYSTEM WITH (A) AN ACID MONOMER OF THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID AND (B) A NEUTRAL MONOMER OF THE GROUP CONSISTING OF METHYL METHACRYLATE AND METHYL ACRYLATE IN THE PRESENCE OF AN INITIATOR CONSISTING OF A MAGNETIC POLYPHOSPHATE, THEREBY FORMING COPOLYMER CHAINS OF THE ACID MONOMER AND NEUTRAL MONOMER ON THE CELLULOSE, SAID COPOLYMER CHAINS BEING CHEMICALLY BOUND TO THE CELLULOSE SUCH THAT THEY ARE NOT REMOVED BY WASHING IN DILUTE AQUEOUS SODIUM BICARBONATE SOLUTION.
Claim 2
Dependent Claim
122 words
THE PROCESS FOR GRAFTING AN ACID MONOMER ONTO CELLULOSE TO FORM REACTION KPRODUCTS WHILE RETAINING THE GENERAL PHYSICAL STRUCTURE OR FORM OF THE UNTREATED CELLULOSE WHICH COMPRISES PROVIDING CELLULOSE HAVING REACTIVE SITES ALONG THE CELLULOSE CHAIN, TREATING THE CELLULOSE IN AN AQUEOUS ACID SYSTEM WITH (A) AN ACID MONOMER OF THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID AND (B) A NEUTRAL MONOMER OF THE GROUP CONSISTING OF METHYL METHACRYLATE AND METHYL ACRYLATE IN THE PRESENCE OF AN INITIATOR CONSISTING OF A MAGNETIC POLYPHOSPHATE, THEREBY FORMING COPOLYMER CHAINS OF THE ACID MONOMER AND NEUTRAL MONOMER ON THE CELLULOSE, SAID COPOLYMER CHAINS BEING CHEMICALLY BOUND TO THE CELLULOSE SUCH THAT THEY ARE NOT REMOVED BY WASHING IN DILUTE AQUEOUS SODIUM BICARBONATE SOLUTION.
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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |