US3285886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threshold treatment of water with water dispersible complexing polymers
Assignee: WR Grace and Co
•
Filing: 1963-02-20
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Granted: 1966-11-15
•
Expires: 1983-02-20
Abstract
No abstract record available.
Inventors
- 👤 Lewis O Gunderson
- 👤 Kerst Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A WATER DISPERSIBLE POLYMER HAVING COMPLEXING PROPERTIES CONSISTING ESSENTIALLY OF A LINEAR ALIPHATIC BACKBONE WITH SAID CHAINS OF N - CARBOXYMETHYL AMIDE GROUPS, N - CARBOXYMETHYL AMIDE AND N - )2 - HYDROXYETHYL) AMIDE GROUPS, OR N - CARBOXYMETHYL AMIDE AND CARBOXYLIC ACID GROUPS.
Claim 2
Dependent Claim
44 words
A WATER DISPERSIBLE POLYMER HAVING COMPLEXING PROPERTIES CONSISTING ESSENTIALLY OF A LINEAR ALIPHATIC BACKBONE WITH SAID CHAINS OF N - CARBOXYMETHYL AMIDE GROUPS, N - CARBOXYMETHYL AMIDE AND N - )2 - HYDROXYETHYL) AMIDE GROUPS, OR N - CARBOXYMETHYL AMIDE AND CARBOXYLIC ACID GROUPS.
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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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |