US2811511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer from alpha-hydroxy isobutyric acid
Assignee: EIDP Inc
•
Filing: 1953-11-12
•
Granted: 1957-10-29
•
Expires: 1973-11-12
Abstract
No abstract record available.
Inventors
- 👤 Alderson Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A-HYDROXYISOBUTYRIC ACID HOMOPOLYMER OF INHERENT VICOSITY OF AT LEAST 0.7 MEASURED AT 0.5% CONCENTRATION IN A SOLUTION OF 10 PARTS PHENOL TO 7 PARTS TRICHLOROPHENOL MIXTURE, STABLE TO ALKALI AND ORIENTABLE.
Claim 2
Dependent Claim
31 words
A-HYDROXYISOBUTYRIC ACID HOMOPOLYMER OF INHERENT VICOSITY OF AT LEAST 0.7 MEASURED AT 0.5% CONCENTRATION IN A SOLUTION OF 10 PARTS PHENOL TO 7 PARTS TRICHLOROPHENOL MIXTURE, STABLE TO ALKALI AND ORIENTABLE.
References Cited (Backward Citations)
US2534255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |