US3256077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea-formaldehyde resin bonded abrasive sheet
Assignee: 3M Co
•
Filing: 1963-06-19
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Granted: 1966-06-14
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Expires: 1983-06-19
Abstract
No abstract record available.
Inventors
- 👤 Roger L Abler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:46
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/46; C08G12/02; C08G12/04; C08G12/043; C08G12/046; C08G12/40; C08G12/42; C08G12/421
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
A FLEXIBLE COATED ABRASIVE ARTICLE COMPRISING A BACKING HAVING A LAYER OF ABRASIVE GRAINS ATTACHED THERETO BY A MAKING COAT, AND A SANDSIZE OVER THE MAKING COAT CONSISTING ESSENTIALLY OF THE NON-CRAZING REACTION PRODUCT OF (A) UREA, (B) FROM 0.01 TO 0.5 MOLE PER MOLE OF UREA OF A SOLUBLE DIAMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, PHENYLHYDRAZINE, DIAMINO BENZENE AND PIPERAZINE, (C) FORMALDEHYDE IN A TOTAL AMOUNT AT LEAST EQUAL TO 1.1 MOLES PER MOLE OF UREA AND 2 MOLES PER MOLE OF SAID DIAMINO COMPOUND, AND (D) FROM 0.08 TO 1 PART BY WEIGHT OF UREA OF A WATER-SOLUBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON DIOLS, POLYETHER DIOLS, AND SULFUR ANALOGUES OF SAID DIOLS WHEREIN AT LEAST ONE OH GROUP HAS BEEN REPLACED BY AN SH GROUP.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |