US2831837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyunsaturated derivatives of polyhy-dric alcohol amines and polymers
Assignee: Shell Development Co
•
Filing: 1955-10-31
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Granted: 1958-04-22
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Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Theodore W Evans
- 👤 Seaver A Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:41
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
AN INSOLUBLE INFUSIBLE COPOLYMER OF N-(ALLYLOXYHYDROXYPROPYL)-1-AMINO-3-ALLYOXY-2-PROPANOL AND A MONOMER CONTAINING A CH2=C=GROUP.
Claim 2
Dependent Claim
12 words
AN INSOLUBLE INFUSIBLE COPOLYMER OF N-(ALLYLOXYHYDROXYPROPYL)-1-AMINO-3-ALLYOXY-2-PROPANOL AND A MONOMER CONTAINING A CH2=C=GROUP.
Claim 3
Dependent Claim
17 words
A COPOLYMER AS DEFINED IN CLAIM 13 WHEREIN THE MONOMER CONTAINING THE CH2=C= GROUP IS MALEIC ANHYDRIDE.
References Cited (Backward Citations)
US2541088A
Cited
US2497553A
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US2631995A
Cited
US2712015A
Cited
US2735842A
Cited
US2744098A
Cited
US2676949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |