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Patent US2652374A successfully refreshed from Google Patents.
US2652374A
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Water resistant paper coatings and method of making same from ureaformaldehyde, ammonium metaphosphate, amylaceous material, and clay
Assignee: CALGON Inc
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Filing: 1951-01-31
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Granted: 1953-09-15
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Expires: 1971-01-31
Abstract
No abstract record available.
Inventors
- 👤 Ralph N Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:42
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/54; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A WATER-RESISTANT PAPER COATING COLOR IN THE FORM OF AN AQUEOUS SLURRY, THE NON-AQUEOUS PORTION OF WHICH COMPRISES A CLAY, AN AMYLACEOUS MATERIAL, A UREAFORMALDEHYDE RESIN AND AMMONIUM METAPHOSPHATE.
Claim 2
Dependent Claim
29 words
A WATER-RESISTANT PAPER COATING COLOR IN THE FORM OF AN AQUEOUS SLURRY, THE NON-AQUEOUS PORTION OF WHICH COMPRISES A CLAY, AN AMYLACEOUS MATERIAL, A UREAFORMALDEHYDE RESIN AND AMMONIUM METAPHOSPHATE.
References Cited (Backward Citations)
US2399489A
Cited
US2471743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |