Patent US2859187A successfully refreshed from Google Patents.
US2859187A
Expired / Lapsed
US
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Fireproof door core of phenol formal-dehyde, wood chips and diammonium phosphate
Assignee: Roddis Plywood Corp
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Filing: 1954-07-06
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Granted: 1958-11-04
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Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Leonard A Ropella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:16
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A RIGID CORE FOR FIREPROOF DOORS AND PANELS COMPRISING WOOD CHIPS OF 1/2 TO 1/8 INCH MESH HAVING A DENSITY BETWEEN 0.38 AND 0.40, A THERMOSETTING PHENOL FORMALDEHYDE CONDENSATION PRODUCT BINDER AMOUNTING TO 8% OF THE WEIGHT OF THE CHIPS, INSERT MINERAL FILLER FROM THE GROUP CONSISTING OF CLAY AND BENTONOTE AMOUNTING TO 15% OF WEIGHT OF THE CHIPS, DIAMMONIUM PHOSPHATE CRYSTALS AMOUNTING TO 15% OF THE WEIGHT OF THE CHIPS, SAID CORE AFTER SETTING OF THE BINDER HAVING A DENSITY OF 0.70.
Claim 2
Dependent Claim
83 words
A RIGID CORE FOR FIREPROOF DOORS AND PANELS COMPRISING WOOD CHIPS OF 1/2 TO 1/8 INCH MESH HAVING A DENSITY BETWEEN 0.38 AND 0.40, A THERMOSETTING PHENOL FORMALDEHYDE CONDENSATION PRODUCT BINDER AMOUNTING TO 8% OF THE WEIGHT OF THE CHIPS, INSERT MINERAL FILLER FROM THE GROUP CONSISTING OF CLAY AND BENTONOTE AMOUNTING TO 15% OF WEIGHT OF THE CHIPS, DIAMMONIUM PHOSPHATE CRYSTALS AMOUNTING TO 15% OF THE WEIGHT OF THE CHIPS, SAID CORE AFTER SETTING OF THE BINDER HAVING A DENSITY OF 0.70.
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) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |