US3922251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel sulfanilamide-aldehyde copolymer
Assignee: Cities Service Oil Co
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Filing: 1974-06-19
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Granted: 1975-11-25
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Expires: 1994-06-19
Abstract
Abstract WHEREIN Q is the aldehyde residue and R is hydrogen, alkyl, haloalkyl, alkoxy, haloalkoxy, halo, nitro, acetamido, or sulfonamido. According to a preferred embodiment of the invention, the copolymers are sulfanilamide-formaldehyde copolymers having such repeating units. The novel copolymers of the invention are low molecular weight, water-insoluble, organic solvent-soluble amine-aldehyde copolymers having the repeating unit:
Inventors
- 👤 Shirley H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/06; C08G12/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
A WATER-INSOLUBLE AMINE-ALDEHYDE COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF ABOUT 350-2000 AND CONSISTING ESSENTIALLY OF REPEATING UNITS CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
23 words
A WATER-INSOLUBLE AMINE-ALDEHYDE COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF ABOUT 350-2000 AND CONSISTING ESSENTIALLY OF REPEATING UNITS CORRESPONDING TO THE FORMULA:
Claim 3
Dependent Claim
9 words
The copolymer of claim 1 wherein R is hydrogen.
Claim 4
Dependent Claim
17 words
The copolymer of claim 2 wherein the amine portion of the repeating unit corresponds to the formula:
Claim 5
Dependent Claim
17 words
The copolymer of claim 1 wherein Q is the residue of an alkanal containing 1-5 carbon atoms.
Claim 6
Dependent Claim
10 words
The copolymer of claim 4 wherein the alkanal is formaldehyde.
Claim 7
Dependent Claim
13 words
The copolymer of claim 1 wherein the repeating units correspond to the formula:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |