Patent US3122278A successfully refreshed from Google Patents.
Patent US3154436A successfully refreshed from Google Patents.
US3154436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rewettable battery separator
Assignee: WR Grace and Co
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Filing: 1961-04-04
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Granted: 1964-10-27
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Expires: 1981-04-04
Abstract
No abstract record available.
Inventors
- 👤 Paul B Tomaino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:37
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; C; C08; C08L; C08L61/00; C08L61/04; C08L61/06; H01M50/411; H01M50/429; H01M50/4295; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PHENOL FORMALDEHYDE RESIN IMPREGNATED FIBROUS PLATE SEPARATOR FOR SECONDARY ELECTRIC CELLS THAT HAS BEEN RENDERED PERMANENTLY REWETTABLE BY THE PRESENCE OF BETWEEN ABOUT ONE HALF AND ABOUT FIVE PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE RESIN OF A PROPYLENE OXIDE ADDUCT OF HEXANE TRIOL, SAID ADDUCT HAVING A MOLECULAR WEIGHT BETWEEN 700 AND 4000 AND A HYDROXYL NUMBER BETWEEN 42 AND 240.
Claim 2
Dependent Claim
65 words
A PHENOL FORMALDEHYDE RESIN IMPREGNATED FIBROUS PLATE SEPARATOR FOR SECONDARY ELECTRIC CELLS THAT HAS BEEN RENDERED PERMANENTLY REWETTABLE BY THE PRESENCE OF BETWEEN ABOUT ONE HALF AND ABOUT FIVE PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE RESIN OF A PROPYLENE OXIDE ADDUCT OF HEXANE TRIOL, SAID ADDUCT HAVING A MOLECULAR WEIGHT BETWEEN 700 AND 4000 AND A HYDROXYL NUMBER BETWEEN 42 AND 240.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |