Patent EP0238410A2 successfully refreshed from Google Patents.
US2596136A
Expired / Lapsed
US
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Thermostiffening sheet material and process of making same
Assignee: Beckwith Manufacturing Co
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Filing: 1950-06-27
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Granted: 1952-05-13
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Expires: 1970-06-27
Abstract
No abstract record available.
Inventors
- 👤 Wentworth A Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:48
CPC Classifications
A; A43; A43B; A43B23/00; A43B23/08; A43B23/16; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T428/23986; Y10T428/31504; Y10T428/31801; Y10T428/31942
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A SHOE STIFFENER COMPRISING A FABRIC IMPREGNATED WITH A MIXTURE COMPRISING THE INITAL CONDENSATION PRODUCT OF PHENOL-FORMALDEHYDE AND THE INITIAL CONDENSATION PRODUCT OF UREA FURFURAL AND CONTAINING DISPERSED THROUGHOUT THE MASS OF RESIN COMMINUTED PARTICLES COMPRISING A MIXTURE OF OPAL WAX IN WHICH IS INCORPORATED A CATALYST SELECTED FROM THE GROUP CONSISTING OF DIAMMONIUM PHOSPHATE, BENZOIC ACID, PHTHALIC ANHYDRIDE, BENZOYL PEROXIDE, AND MALECIC ACID.
References Cited (Backward Citations)
GB583471A
Cited
US2433680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |