US3577248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight linear alkyl benzene sulfonate as frothing agents for gypsum board manufacture
Assignee: Atlantic Richfield Co
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Filing: 1967-11-06
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Granted: 1971-05-04
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Expires: 1987-11-06
Abstract
Abstract THIS INVENTION RELATES TO GYPSUM BOARDS AND TO A METHOD FOR PRODUCING THE BOARD WHICH UTILIZES AS A FROTHING AGENT AND ALKYL BENZENE SULFONATE HAVING A LINEAR SECONDARY ALKYL SIDE CHAIN WITH AN AVERAGE CARBON CONTENT RANGING FROM 8.5 TO 10.5 AND A MAXIMUM CARBON NUMBER SPREAD OF 8 CARBON ATOMS. PREFERABLY, THE AVERAGE CARBON CONTENT RANGES FROM 9.5 TO 10.5 AND THE CARBON NUMBER SPRAD IS A MAXIMUM OF 5 CARBON ATOMS. THIS FROTHING AGENT IS GENERALLY UTILIZED IN AMOUNTS RANGING FROM 0.01 TO 0.1 PART PER 100 PARTS BY WEIGHT GYPSUM.
Inventors
- 👤 Robert B Doan
- 👤 Robert C Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:15
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |