US2653146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of beta-methylene-betapropiolactone copolymers
Assignee: EIDP Inc
•
Filing: 1950-12-07
•
Granted: 1953-09-22
•
Expires: 1970-12-07
Abstract
No abstract record available.
Inventors
- 👤 Gray Hugh William
- 👤 Theobald Clement Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:16
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F2800/00; C08F2800/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
PROCESS WHICH COMPRISES REACTING A COPOLYMER OF BETA-METHYLENE-BETA-PROPIOLACTONE AND ANOTHER COPOLYMERIZABLE ORGANIC COMPOUND CONTAINING ETHYLENE UNSATURATION, SAID COPOLYMER CONTAINING BETA-PROPIOLACTONE RINGS WHEREIN A RING CARBON IS ALSO PART OF THE MAIN POLYMER CHAIN, AND BEING FREE OF PYRONE RINGS, WITH AT LEAST 0.01 MOLE OF A COMPOUND CONTAINING ACTIVE HYDROGEN AS DETERMINED BY THE ZEREWITNOFFTSCHUGAEFF METHOD, FROM THE GROUP CONSISTING OF AMMONIA, AMINES, AND HYDRAZINE PER MOLE OF CHEMICALLY COMBINED BETA-METHYLENE-BETA-PROPIOLACTONE IN SAID COPOLYMER AT A TEMPERATURE OF 20* C. TO 175* C. UNTIL AT LEAST AN APPRECIABLE PROPORTION OF SAID BETA-PROPIOLACTONE RINGS ARE CLEAVED.
Claim 2
Dependent Claim
95 words
PROCESS WHICH COMPRISES REACTING A COPOLYMER OF BETA-METHYLENE-BETA-PROPIOLACTONE AND ANOTHER COPOLYMERIZABLE ORGANIC COMPOUND CONTAINING ETHYLENE UNSATURATION, SAID COPOLYMER CONTAINING BETA-PROPIOLACTONE RINGS WHEREIN A RING CARBON IS ALSO PART OF THE MAIN POLYMER CHAIN, AND BEING FREE OF PYRONE RINGS, WITH AT LEAST 0.01 MOLE OF A COMPOUND CONTAINING ACTIVE HYDROGEN AS DETERMINED BY THE ZEREWITNOFFTSCHUGAEFF METHOD, FROM THE GROUP CONSISTING OF AMMONIA, AMINES, AND HYDRAZINE PER MOLE OF CHEMICALLY COMBINED BETA-METHYLENE-BETA-PROPIOLACTONE IN SAID COPOLYMER AT A TEMPERATURE OF 20* C. TO 175* C. UNTIL AT LEAST AN APPRECIABLE PROPORTION OF SAID BETA-PROPIOLACTONE RINGS ARE CLEAVED.
References Cited (Backward Citations)
US2560694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |