US2998324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating polypropylene
Assignee: Hercules Powder Co
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Filing: 1959-07-22
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Granted: 1961-08-29
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Expires: 1979-07-22
Abstract
No abstract record available.
Inventors
- 👤 Robert P Hirt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:17
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; B; B32; B32B; B32B27/00; C08J7/04; C08J7/043; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/3187
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF COATING A CRYSTALLINE POLYMER OF PROPYLENE COMPRISING THE STEPS OF (1) TREATING THE POLYMER TO MODIFY ITS SURFACE TO THE POINT THAT A DROP OF A TEST LIQUID COMPOSED OF 74% ETHANOL AND 26% WATER APPLIED TO A HORIZONTAL SURFACE OF THE TREATED POLYMER SPREADS UNIFORMLY, (2) APPLYING TO THE TREATED SURFACE A WASH PRIMER PREPARED FROM INGREDIENTS INCLUDING POLY(VINYL BUTYRAL), PHOSPHORIC ACID AND A CHROMIUM COMPOUND OF THE GROUP CONSISTING OF CHROMIUM TRIOXIDE AND INSOLUBLE ZINC CHROMATE; AND (3) APPLYING TO THE PRIMED SURFACE AS A TOP COAT A LACQUER CONTAINING AS ITS ESSENTIAL FILM-FORMING COMPONENTS NITROCELLULOSE AND AN ALCOHOLSOLUBLE THERMOSETTING RESIN RESULTING FROM THE CONDENSATION OF REACTANTS INCLUDING A LOWER ALIPHATIC ALDEHYDE AND AN AMINE OF THE GROUP CONSISTING OF UREA AND MELAMINE.
Claim 2
Independent Claim
128 words
THE METHOD OF COATING A CRYSTALLINE POLYMER OF PROPYLENE COMPRISING THE STEPS OF (1) TREATING THE POLYMER TO MODIFY ITS SURFACE TO THE POINT THAT A DROP OF A TEST LIQUID COMPOSED OF 74% ETHANOL AND 26% WATER APPLIED TO A HORIZONTAL SURFACE OF THE TREATED POLYMER SPREADS UNIFORMLY, (2) APPLYING TO THE TREATED SURFACE A WASH PRIMER PREPARED FROM INGREDIENTS INCLUDING POLY(VINYL BUTYRAL), PHOSPHORIC ACID AND A CHROMIUM COMPOUND OF THE GROUP CONSISTING OF CHROMIUM TRIOXIDE AND INSOLUBLE ZINC CHROMATE; AND (3) APPLYING TO THE PRIMED SURFACE AS A TOP COAT A LACQUER CONTAINING AS ITS ESSENTIAL FILM-FORMING COMPONENTS NITROCELLULOSE AND AN ALCOHOLSOLUBLE THERMOSETTING RESIN RESULTING FROM THE CONDENSATION OF REACTANTS INCLUDING A LOWER ALIPHATIC ALDEHYDE AND AN AMINE OF THE GROUP CONSISTING OF UREA AND MELAMINE.
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |