Patent US2754728A successfully refreshed from Google Patents.
US2754728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raintable hardboard and process of making the same
Assignee: Individual
•
Filing: 1951-11-17
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Granted: 1956-07-17
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Expires: 1971-11-17
Abstract
No abstract record available.
Inventors
- 👤 William J Runckel
- 👤 George R Bethel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:57
CPC Classifications
D; D21; D21J; D21J1/00; D21J1/08; C; C08; C08L; C08L97/00; C08L97/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
THE PROCESS OF MAKING A HARD, STIFF, BOARD PRODUCT HAVING A PAINTABLE SURFACE WHICH COMPRISES WET FORMING A MAT OF PARTICLES OF LIGNOCELLULOSE MATERIAL, APPLYING TO AT LEAST ONE SURFACE OF THE MAT FROM ABOUT 0.2% TO ABOUT 5.0% BY WEIGHT, BASED ON THE DRY WEIGHT OF THE LIGNOCELLULOSE MATERIAL, OF THE PINE WOOD PITCH RESIDUE REMAINING AFTER REMOVAL FROM THE PITCH OF THE STREAM VOLATILE MATERIALS AND THE ROSIN, AND THEREAFTER CONSOLIDATING THE MAT TO FORM THE BOARD PRODUCT, THE BODY OF THE CONSOLIDATED MAT BEING SUBSTANTIALLY DEVOID OF THE SAID PINE WOOD PITCH RESIDUE.
References Cited (Backward Citations)
CA472441A
Cited
US2312831A
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US2372433A
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US2416721A
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US2654296A
Cited
US2550465A
Cited
US2681637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |