Patent US4472481A successfully refreshed from Google Patents.
Patent US2719798A successfully refreshed from Google Patents.
US2719798A
Expired / Lapsed
US
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Moisture-resistant regenerated cellulose film
Assignee: Wyeth Holdings LLC
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Filing: 1954-02-09
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Granted: 1955-10-04
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Expires: 1974-02-09
Abstract
No abstract record available.
Inventors
- 👤 William M Wooding
- 👤 Suen Tzeng Jiueq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:40
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J2301/00; C08J2301/06; C08J2475/00; C08J2475/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31953
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A SUBSTANTIALLY NEUTRAL NON-FIBROUS REGENERATED CELLULOSE FILM IMPREGNATED WITH A SUBSTANTIALLY NEUTRAL UREA-FRMALDEHYDE-AMINOALKY CARBOXYLIC ACID RESIN CURED BEYOND ITS GEL POINT AND COATED WITH A WATER-REPELLENT TOPCOAT, SAID AMINOALKYL CARBOXYLIC ACID CONTAINING NOT MORE THAN 6 CARBON ATOMS; SAID RESIN CONTAINING, PER MOLE OF COMBINED UREA, FROM 1.8 TO 3.5 MOLS OF COMBINED FORMALDEHYDE AND FROM 0.03 TO 0.3 MOL OF COMBINED AMINOALKYL CARBOXYLIC ACID.
Claim 2
Dependent Claim
65 words
A SUBSTANTIALLY NEUTRAL NON-FIBROUS REGENERATED CELLULOSE FILM IMPREGNATED WITH A SUBSTANTIALLY NEUTRAL UREA-FRMALDEHYDE-AMINOALKY CARBOXYLIC ACID RESIN CURED BEYOND ITS GEL POINT AND COATED WITH A WATER-REPELLENT TOPCOAT, SAID AMINOALKYL CARBOXYLIC ACID CONTAINING NOT MORE THAN 6 CARBON ATOMS; SAID RESIN CONTAINING, PER MOLE OF COMBINED UREA, FROM 1.8 TO 3.5 MOLS OF COMBINED FORMALDEHYDE AND FROM 0.03 TO 0.3 MOL OF COMBINED AMINOALKYL CARBOXYLIC ACID.
References Cited (Backward Citations)
US2389415A
Cited
US2646368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |