US3424835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propiolactone-pivalolactone copolyesters
Assignee: EIDP Inc
•
Filing: 1964-04-20
•
Granted: 1969-01-28
•
Expires: 1984-04-20
Abstract
No abstract record available.
Inventors
- 👤 Albert G Armour
- 👤 Erhard F Hoegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/625; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A COPOLYMER OF PROPIOLACTONE AND PIVALOLACTONE, CONTAINING 50 TO 90 PERCENT, BY WEIGHT, OF PIVALOLACTONE.
Claim 2
Dependent Claim
15 words
A COPOLYMER OF PROPIOLACTONE AND PIVALOLACTONE, CONTAINING 50 TO 90 PERCENT, BY WEIGHT, OF PIVALOLACTONE.
References Cited (Backward Citations)
US2683136A
Cited
US2658055A
Cited
FR1231163A
Cited
BE592333A
Cited
US3190858A
Cited
US3300451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |