Patent US3879703A successfully refreshed from Google Patents.
Patent US3202620A successfully refreshed from Google Patents.
US3202620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane plastics
Assignee: Bayer AG
•
Filing: 1960-11-23
•
Granted: 1965-08-24
•
Expires: 1980-11-23
Abstract
No abstract record available.
Inventors
- 👤 Merten Rudolf
- 👤 Muller Erwin
- 👤 Braun Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/54; C08G18/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A CELLULAR POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING IN THE PRESENCE OF A BLOWING AGENT AN ORGANIC POLYISOCYANATE WITH A POLYOL PREPARED BY A PROCESS WHICH COMPRISES CONDENSING A CARBOHYDRATE HAVING AT LEASST 4 CARBON ATOMS, AN OXO COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALDEHYDES AND KETONES AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS AND PHENOLS.
Claim 2
Dependent Claim
63 words
A CELLULAR POLYURETHANE PLASTIC PREPARED BY A PROCESS WHICH COMPRISES REACTING IN THE PRESENCE OF A BLOWING AGENT AN ORGANIC POLYISOCYANATE WITH A POLYOL PREPARED BY A PROCESS WHICH COMPRISES CONDENSING A CARBOHYDRATE HAVING AT LEASST 4 CARBON ATOMS, AN OXO COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALDEHYDES AND KETONES AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS AND PHENOLS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |