Patent US2741571A successfully refreshed from Google Patents.
Patent US2800465A successfully refreshed from Google Patents.
US2800465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-stage manufacture of copolymers
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-12-29
•
Granted: 1957-07-23
•
Expires: 1973-12-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Nelson
- 👤 Robert F Leary
- 👤 Welch Lester Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:23
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S260/00; Y10S260/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A PROCESS OF COPLYMERIZING A LOWER ALIPHATIC MONO-XX WITH A POLYMERIZABLE MONO-OLEFINIC COMPOUND CONTAINING A CYCLIC NUCLEUS, AT A TEMPERATURE OF ABOUT 10*F. TO -160*F., IN THE PRESENCE OF A FRIEDELCRAFTS CATALYST, CONTINUOUSLY IN TWO STAGES, THE IMPROVEMENT COMPRISING PRODUCING IN ONE BUT ONLY ONE STAGE A COPLYMER HAVING 65-95% OF THE DESIRED FINAL AVERAGE PERCENT OF COMBINED CYCLIC CONSITUENTS, AND IN THE OTHER STAGE MAKING A COPOLYMER HAVING 250 TO 105% OF THE DESIRED FINAL AVERAGE PERCENT OF COMBINED CYCLIC CONSITUENTS.
Claim 2
Dependent Claim
83 words
IN A PROCESS OF COPLYMERIZING A LOWER ALIPHATIC MONO-XX WITH A POLYMERIZABLE MONO-OLEFINIC COMPOUND CONTAINING A CYCLIC NUCLEUS, AT A TEMPERATURE OF ABOUT 10*F. TO -160*F., IN THE PRESENCE OF A FRIEDELCRAFTS CATALYST, CONTINUOUSLY IN TWO STAGES, THE IMPROVEMENT COMPRISING PRODUCING IN ONE BUT ONLY ONE STAGE A COPLYMER HAVING 65-95% OF THE DESIRED FINAL AVERAGE PERCENT OF COMBINED CYCLIC CONSITUENTS, AND IN THE OTHER STAGE MAKING A COPOLYMER HAVING 250 TO 105% OF THE DESIRED FINAL AVERAGE PERCENT OF COMBINED CYCLIC CONSITUENTS.
References Cited (Backward Citations)
US2666046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |