US3225505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant door
Assignee: Individual
•
Filing: 1963-08-13
•
Granted: 1965-12-28
•
Expires: 1983-08-13
Abstract
No abstract record available.
Inventors
- 👤 Lucian C Lytz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:16
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A FIRE-RESISTANT DOOR HAVING A ONE-PIECE CORE COMPRISING EXPANDED MINERAL PARTICLES, MINERAL FIBERS AND A MINERAL BINDER, WHICH IS SUBSTANTIALLY FIRE-PROOF AND DIMENSIONALLY STABLE, A FRAME OF SUBSTANTIALLY THE SAME THICKNESS AS THE CORE SURROUNDING THE EDGES THEREOF COMPRISING FIRE-RESISTANT RAILS AND STILES, SAID RAILS AND STILES BEING CLOSELY ADJACENT AND UNCONNECTED WITH EACH OTHER AND ALLOWING FREE RELATIVE MOVEMENT BETWEEN THEMSELVES AND THE CORE, A FIRE-STOP BETWEEN SAID FRAME AND CORE IN
Claim 2
Dependent Claim
73 words
A FIRE-RESISTANT DOOR HAVING A ONE-PIECE CORE COMPRISING EXPANDED MINERAL PARTICLES, MINERAL FIBERS AND A MINERAL BINDER, WHICH IS SUBSTANTIALLY FIRE-PROOF AND DIMENSIONALLY STABLE, A FRAME OF SUBSTANTIALLY THE SAME THICKNESS AS THE CORE SURROUNDING THE EDGES THEREOF COMPRISING FIRE-RESISTANT RAILS AND STILES, SAID RAILS AND STILES BEING CLOSELY ADJACENT AND UNCONNECTED WITH EACH OTHER AND ALLOWING FREE RELATIVE MOVEMENT BETWEEN THEMSELVES AND THE CORE, A FIRE-STOP BETWEEN SAID FRAME AND CORE IN
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |