US3352829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane forming compositions containing sulfurous acid esters as retarding agents
Assignee: Bayer AG
•
Filing: 1965-02-09
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Granted: 1967-11-14
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Expires: 1985-02-09
Abstract
No abstract record available.
Inventors
- 👤 Blomeyer Friedrich
- 👤 Zecher Wilfried
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/089; Y; Y10; Y10S; Y10S528/00; Y10S528/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A METHOD OF RETARDING THE REACTION BETWEEN AN ORGANIC ISOCYANATE AND AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD WHICH COMPRISES MIXING SAID ISOCYANATE AND SAID ACTIVE HYDROGEN CONTAINING COMPOUND WITH AN ESTER OF SULPHUROUS ACID HAVING THE FORMULA R2SO3 WHEREIN R IS ALKYL OR ARYL.
Claim 2
Independent Claim
52 words
A METHOD OF RETARDING THE REACTION BETWEEN AN ORGANIC ISOCYANATE AND AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD WHICH COMPRISES MIXING SAID ISOCYANATE AND SAID ACTIVE HYDROGEN CONTAINING COMPOUND WITH AN ESTER OF SULPHUROUS ACID HAVING THE FORMULA R2SO3 WHEREIN R IS ALKYL OR ARYL.
Claim 3
Dependent Claim
42 words
AN IMPROVED COATING COMPOSITION WHICH COMPRISES A MIXTURE OF AN ORGANIC POLYISOCYANATE, AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD AND AN ESTER OF SULPHUROUS ACID HAVING THE FORMULA R2SO3 WHEREIN R IS ALKYL OR ARYL.
Claim 4
Dependent Claim
42 words
AN IMPROVED COATING COMPOSITION WHICH COMPRISES A MIXTURE OF AN ORGANIC POLYISOCYANATE, AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD AND AN ESTER OF SULPHUROUS ACID HAVING THE FORMULA R2SO3 WHEREIN R IS ALKYL OR ARYL.
References Cited (Backward Citations)
DE1131002B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |