US2707707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biuret-urea blowing agent used for producing cellular materials
Assignee: Sherwin Williams Co
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Filing: 1949-05-05
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Granted: 1955-05-03
•
Expires: 1969-05-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08L; C08L21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF PRODUCING CELLULAR PRODUCTS WHICH COMPRISES INCORPORATING INTO A MILLABLE POLYMER WHICH IS PLASTIC AT TEMPERATURES IN THE RANGE OF 266 DEGREES F. TO 350 DEGREES F. 4 TO 15 PARTS PER HUNDRED PARTS BY WEIGHT OF SAID POLYMER OF A GAS PRODUCING COMPOSITION, OF WHICH A MAJOR PROPORTION IS BIURET AND AT LEAST 1 PER CENT BY WEIGHT IS UREA, AND HEATING THE RESULTANT MATERIAL TO TEMPERATURES AT WHICH THE BIURET AND UREA REACT TO PRODUCE AMMONIA.
Claim 2
Independent Claim
80 words
A METHOD OF PRODUCING CELLULAR PRODUCTS WHICH COMPRISES INCORPORATING INTO A MILLABLE POLYMER WHICH IS PLASTIC AT TEMPERATURES IN THE RANGE OF 266 DEGREES F. TO 350 DEGREES F. 4 TO 15 PARTS PER HUNDRED PARTS BY WEIGHT OF SAID POLYMER OF A GAS PRODUCING COMPOSITION, OF WHICH A MAJOR PROPORTION IS BIURET AND AT LEAST 1 PER CENT BY WEIGHT IS UREA, AND HEATING THE RESULTANT MATERIAL TO TEMPERATURES AT WHICH THE BIURET AND UREA REACT TO PRODUCE AMMONIA.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |