US2704262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of superficially saponifying a cellulose ester film
Assignee: Hartford National Bank and Trust Co
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Filing: 1951-06-06
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Granted: 1955-03-15
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Expires: 1971-06-06
Abstract
No abstract record available.
Inventors
- 👤 Alink Roelof Jan Hendrik
- 👤 Jasp Johannes Corneli Antonius
- 👤 Tijs Willem Van Rijssel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:55
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; C; C08; C08B; C08B3/00; C08B3/22; C08B3/24; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS OF SUPERFICIALLY SAPONIFYING A STRIP OF CELLULOSE ESTER CONTAINING BETWEEN 1.5 AND 3.0 MOLECULES OF FATTY ACID PER GLUCOSE RESIDUE, WHICH COMPRISES THE STEPS OF IMMERSING SAID STRIP IN A SAPONIFYING BATH CONTAINING AT LEAT A 0.1 NORMAL SOLUTION OF AN ALKALI HYDROXIDE AND AN ALCOHOLIC SOLVENT TO EFFECT RAPID SAPONIFICATION OF SAID STRIP FOR A TIME SUFFICEINT TO PRODUCE A PARTIALLY-SAPONIFIED INTERMEDIATE LAYER IN SAID STRIP CONTAINING BETWEEN 0.5 AND 1.5 FATTY ACID MOLECULES PER GLUCOSE RESIDUE, AND THEREAFTER IMMERSING SAID STRIP FOR AT LEAST 30 SECONDS IN AN AQUEOUS STOP BATH CONTAINING AT LEAST 0.12 GRAM MOLECULES PER LITER OF A WATER-SOLUBLE ANTI-PEELING AGENT CONSISTING OF A WATER-SOLUBLE FLUORIDE TO PREVENT PEELING OF THE SAPONIFIED LAYER.
Claim 2
Dependent Claim
120 words
A PROCESS OF SUPERFICIALLY SAPONIFYING A STRIP OF CELLULOSE ESTER CONTAINING BETWEEN 1.5 AND 3.0 MOLECULES OF FATTY ACID PER GLUCOSE RESIDUE, WHICH COMPRISES THE STEPS OF IMMERSING SAID STRIP IN A SAPONIFYING BATH CONTAINING AT LEAT A 0.1 NORMAL SOLUTION OF AN ALKALI HYDROXIDE AND AN ALCOHOLIC SOLVENT TO EFFECT RAPID SAPONIFICATION OF SAID STRIP FOR A TIME SUFFICEINT TO PRODUCE A PARTIALLY-SAPONIFIED INTERMEDIATE LAYER IN SAID STRIP CONTAINING BETWEEN 0.5 AND 1.5 FATTY ACID MOLECULES PER GLUCOSE RESIDUE, AND THEREAFTER IMMERSING SAID STRIP FOR AT LEAST 30 SECONDS IN AN AQUEOUS STOP BATH CONTAINING AT LEAST 0.12 GRAM MOLECULES PER LITER OF A WATER-SOLUBLE ANTI-PEELING AGENT CONSISTING OF A WATER-SOLUBLE FLUORIDE TO PREVENT PEELING OF THE SAPONIFIED LAYER.
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) | 1958-03-14 | 1958-09-13 | 1959-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-14 | 1962-09-13 | 1963-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-14 | 1966-09-13 | 1967-03-15 | $7700.00 | Window Closed / Lapsed |