Patent US4343757A successfully refreshed from Google Patents.
Patent US3351676A successfully refreshed from Google Patents.
US3351676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a polyurethane containing 0.2 to 5% polyolefin
Assignee: Bayer Corp
•
Filing: 1964-05-04
•
Granted: 1967-11-07
•
Expires: 1984-05-04
Abstract
No abstract record available.
Inventors
- 👤 James H Saunders
- 👤 Steingiser Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:30
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN A METHOD FOR SIMULTANEOUSLY PROTECTING A POLYURETHANE REACTION MIXTURE FROM MOISTURE ABSORPTION AND PROVIDING A LUBRICANT FOR SUBSEQUENT SHAPING OPERATIONS WHEREIN THE POLYURETHANE HAS FROM ABOUT 0.2 PERCENT TO ABOUT 5 PERCENT BY WEIGHT OF A POLYOLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, AND MIXTURES THEREOF DISPERSED SUBSTANTIALLY UNIFORMLY THEREIN, SAID POLYOLEFIN HAVING A MELT INDEX OF AT LEAST ABOUT 115 AND A MOLECULAR WEIGHT OF FROM ABOUT 1000 TO ABOUT 500,000, THE IMPROVEMENT WHICH COMPRISES DISPOSING A MIXTURE OF COMPONENTS WHICH WILL REACT TO FORM A POLYURETHANE BETWEEN TWO SHEETS OF A POLYOLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, AND MIXTURES THEREOF, ALLOWING CHEMCIAL REACTION TO FORM A PRODUCT WHICH CAN BE SHAPED BY THERMOPLASTIC SHAPING METHODS AND THEREAFTER REDUCING THE RESULTING LAMINATE TO PARTICULATE FORM.
Claim 2
Dependent Claim
132 words
IN A METHOD FOR SIMULTANEOUSLY PROTECTING A POLYURETHANE REACTION MIXTURE FROM MOISTURE ABSORPTION AND PROVIDING A LUBRICANT FOR SUBSEQUENT SHAPING OPERATIONS WHEREIN THE POLYURETHANE HAS FROM ABOUT 0.2 PERCENT TO ABOUT 5 PERCENT BY WEIGHT OF A POLYOLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, AND MIXTURES THEREOF DISPERSED SUBSTANTIALLY UNIFORMLY THEREIN, SAID POLYOLEFIN HAVING A MELT INDEX OF AT LEAST ABOUT 115 AND A MOLECULAR WEIGHT OF FROM ABOUT 1000 TO ABOUT 500,000, THE IMPROVEMENT WHICH COMPRISES DISPOSING A MIXTURE OF COMPONENTS WHICH WILL REACT TO FORM A POLYURETHANE BETWEEN TWO SHEETS OF A POLYOLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, AND MIXTURES THEREOF, ALLOWING CHEMCIAL REACTION TO FORM A PRODUCT WHICH CAN BE SHAPED BY THERMOPLASTIC SHAPING METHODS AND THEREAFTER REDUCING THE RESULTING LAMINATE TO PARTICULATE FORM.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |