Patent US2706188A successfully refreshed from Google Patents.
US2706188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of resin coated particle material
Assignee: Individual
•
Filing: 1952-07-05
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Granted: 1955-04-12
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Expires: 1972-07-05
Abstract
No abstract record available.
Inventors
- 👤 Chester W Fitko
- 👤 John S Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:55
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1037; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/3167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF PROVIDING SAND GRAINS WITH INDIVIDUAL COATINGS OF A SOLID NONTACKY POTENTIALLY THERMOSETTING RESIN, WHICH COMPRISES MIXING SAID SAND GRAINS WITH A NORMALLY LIQUID ACIE-CATALYZED THERMOPLASTIC PHENOLFORMALDEHYDE RESIN AND HEXAMETHYLENETETRAMINE IN AN AMOUNT ADEQUATE TO CONVERT SAID RESIN TO A THERMOSETTING CONDITION, HEATING SAID MIXTURE WHILE CONTINUING THE MIXING TO EVAPORATE VOLATILES FROM SAID RESIN AND TO CONVERT IT TO A SOLID CONDITION AND TO PARTIALLY REACT SAID HEXAMETHYLENETRAMINE THEREWITH, AND TERMINATING SAID HEATING WHEN THE RESIN HAS ADVANCED TO THE CONDITION OF A SOLID MELTING IN THE RANGE OF FROM ABOUT 80* C. TO ABOUT 102* C., AND RECOVERING THE COATED SAND GRAINS.
Claim 2
Independent Claim
106 words
THE METHOD OF PROVIDING SAND GRAINS WITH INDIVIDUAL COATINGS OF A SOLID NONTACKY POTENTIALLY THERMOSETTING RESIN, WHICH COMPRISES MIXING SAID SAND GRAINS WITH A NORMALLY LIQUID ACIE-CATALYZED THERMOPLASTIC PHENOLFORMALDEHYDE RESIN AND HEXAMETHYLENETETRAMINE IN AN AMOUNT ADEQUATE TO CONVERT SAID RESIN TO A THERMOSETTING CONDITION, HEATING SAID MIXTURE WHILE CONTINUING THE MIXING TO EVAPORATE VOLATILES FROM SAID RESIN AND TO CONVERT IT TO A SOLID CONDITION AND TO PARTIALLY REACT SAID HEXAMETHYLENETRAMINE THEREWITH, AND TERMINATING SAID HEATING WHEN THE RESIN HAS ADVANCED TO THE CONDITION OF A SOLID MELTING IN THE RANGE OF FROM ABOUT 80* C. TO ABOUT 102* C., AND RECOVERING THE COATED SAND GRAINS.
References Cited (Backward Citations)
US1090439A
Cited
US1508124A
Cited
US1884747A
Cited
US2201321A
Cited
US2521614A
Cited
US2517815A
Cited
US2476933A
Cited
US2491006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |