Patent US2353402A successfully refreshed from Google Patents.
Patent US4290015A successfully refreshed from Google Patents.
Patent US2540446A successfully refreshed from Google Patents.
US2540446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accumulator with electrodes of graphite material
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-04-26
•
Granted: 1951-02-06
•
Expires: 1966-04-26
Abstract
No abstract record available.
Inventors
- 👤 Haayman Pieter Willem
- 👤 Romeyn Frans Cornelis
- 👤 Verwey Evert Johannes Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:17
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/06; H01M10/08; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
AN ACCUMULATOR COMPRISING ELECTRODES AND AN ELECTROLYTE COMPRISING A LEAD-SILICO-FLUORIDE SOLUTION, SAID SOLUTION CONTAINING AN INACTIVE COMPOUND OF A SOLUBLE NAPHTHALENE SULFONIC ACID HAVING A FLOCKING EFFECT AND BEING SUBSTANTIALLY FREE OF REACTION INTERFERING SUBSTITUENTS, SAID FLOCKING EFFECT PREVENTING THE FORMATION OF LEAD TREES ON THE NEGATIVE ELECTRODE ON THE SAID ACCUMULATOR AND SAID ELECTRODES BEING SUBSTANTIALLY INERT TO SAID ELECTROLYTE.
Claim 2
Dependent Claim
61 words
AN ACCUMULATOR COMPRISING ELECTRODES AND AN ELECTROLYTE COMPRISING A LEAD-SILICO-FLUORIDE SOLUTION, SAID SOLUTION CONTAINING AN INACTIVE COMPOUND OF A SOLUBLE NAPHTHALENE SULFONIC ACID HAVING A FLOCKING EFFECT AND BEING SUBSTANTIALLY FREE OF REACTION INTERFERING SUBSTITUENTS, SAID FLOCKING EFFECT PREVENTING THE FORMATION OF LEAD TREES ON THE NEGATIVE ELECTRODE ON THE SAID ACCUMULATOR AND SAID ELECTRODES BEING SUBSTANTIALLY INERT TO SAID ELECTROLYTE.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |