US3806367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylamido-sulfonic acid polymers and their use as rust and tubercle removing agents
Assignee: BITZ LAB Inc
•
Filing: 1972-06-01
•
Granted: 1974-04-23
•
Expires: 1992-06-01
Abstract
Abstract POLYMERS AND COPOLYMERS OF ACRYLAMIDO-SULFONIC ACID COMPOUNDS AND THEIR USE BASICALLY AS DISPERSANTS FOR PARTICLES CONTAINED IN AQUEOUS SYSTEMS. EXEMPLARY OF THE SULFONIC ACID COMPOUND IS 2-ACRYLAMIDO-2-METHYLPROPANE SULFONIC ACID OR WATER-SOLUBLE SALT THEREOF; AND REPRESENTATIVE OF THE CO-MONOMERS WHICH THE ACID IS COPOLYMERIZED WITH CAN BE MENTIONED ACRYLIC ACID AND DERIVATIVES THEREOF, ACRYLAMIDE AND DERIVATIVES THEREOF, VINYL PYRROLIDONE, ETC. THE POLYMERS AND COPOLYMERS ARE SPECIFICALLY USEFUL IN DISPERSING WATER-INSOLUBLE COMPOUNDS OF IRON CALCIUM MAGNESIUM AND ALUMINUM AND SUCH COMMONLY OCCURRING PARTICLES OF SILT AND CLAY.
Inventors
- 👤 K Lange
- 👤 R Schiesser
- 👤 M Dean
- 👤 R Tonkyn
- 👤 R Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:21
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |