Patent US1800575A successfully refreshed from Google Patents.
Patent US3027353A successfully refreshed from Google Patents.
US3027353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polythioethers and polyurethanes therefrom
Assignee: Bayer AG
•
Filing: 1957-08-21
•
Granted: 1962-03-27
•
Expires: 1977-08-21
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/52; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR THE PREPARATION OF A POLYTHIOETHER WHICH IS A HOMOPOLYMER OF THIODIGLYCOL WHICH COMPRISES HEATING A POLYHYDRIC ALCOHOL CONSISTING ESSENTIALLY OF THIODIGLYCOL TO A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 250*C. WHILE MIXED WITH A CATALYTIC AMOUNT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACIDS, ACID PHOSPHATES AND ACID PHOSPHORIC ACID ESTERS HAVING THE FORMULA
Claim 2
Dependent Claim
61 words
A PROCESS FOR THE PREPARATION OF A POLYTHIOETHER WHICH IS A HOMOPOLYMER OF THIODIGLYCOL WHICH COMPRISES HEATING A POLYHYDRIC ALCOHOL CONSISTING ESSENTIALLY OF THIODIGLYCOL TO A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 250*C. WHILE MIXED WITH A CATALYTIC AMOUNT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACIDS, ACID PHOSPHATES AND ACID PHOSPHORIC ACID ESTERS HAVING THE FORMULA
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) | 1965-03-26 | 1965-09-25 | 1966-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-26 | 1969-09-25 | 1970-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-26 | 1973-09-25 | 1974-03-27 | $7700.00 | Window Closed / Lapsed |