Patent US3258010A successfully refreshed from Google Patents.
US3258010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective headgear
Assignee: MSA Safety Inc
•
Filing: 1963-06-19
•
Granted: 1966-06-28
•
Expires: 1983-06-19
Abstract
No abstract record available.
Inventors
- 👤 Harry W Austin
- 👤 John C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:50
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/04; B; B64; B64D; B64D10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
IN HEADGEAR FOR ENCLOSING THE HEAD AND FACE, AN INNER HELMET SHELL FOR RECEIVING THE HEAD AND HAVING A HEAD-ENCIRCLING BASE PORTION AND A REMOVABLE CROWN PORTION, A SUSPENSION UNIT MOUNTED INSIDE SAID SHELL AND CONNECTED TO SAID BASE PORTION FOR SUPPORTING THE SHELL ON THE HEAD, AN OUTER HELMET SHELL CONTAINING THE INNER SHELL BUT SPACED THREFROM, A PERMEABLE FILTER SHELL DISPOSED WITHIN THE SPACE BETWEEN THE HEMET SHELLS, MEANS SPACING THE FILTER SHELL FROM BOTH HELMET SHELLS TO FORM AIR SPACES AT OPPOSITE SIDES OF THE FILTER SHELL, AND MEANS SEALING THE EDGE OF THE AIR SPACE BETWEEN THE FILTER SHELL AND SAID REMOVABLE CROWN PORTION TO FORM A CLOSED CHAMBER BETWEEN THE FILTER SHELL AND INNER SHELL, THE HELMET BEING PROVIDED WITH AN AIR INLET PASSAGE CONNECTED WITH SAID CHAMBER FOR DELIVERING AIR THERETO FOR FILTRATION THROUGH SAID FILTER SHELL INTO THE OTHER OF SAID AIR SPACES.
Claim 2
Dependent Claim
150 words
IN HEADGEAR FOR ENCLOSING THE HEAD AND FACE, AN INNER HELMET SHELL FOR RECEIVING THE HEAD AND HAVING A HEAD-ENCIRCLING BASE PORTION AND A REMOVABLE CROWN PORTION, A SUSPENSION UNIT MOUNTED INSIDE SAID SHELL AND CONNECTED TO SAID BASE PORTION FOR SUPPORTING THE SHELL ON THE HEAD, AN OUTER HELMET SHELL CONTAINING THE INNER SHELL BUT SPACED THREFROM, A PERMEABLE FILTER SHELL DISPOSED WITHIN THE SPACE BETWEEN THE HEMET SHELLS, MEANS SPACING THE FILTER SHELL FROM BOTH HELMET SHELLS TO FORM AIR SPACES AT OPPOSITE SIDES OF THE FILTER SHELL, AND MEANS SEALING THE EDGE OF THE AIR SPACE BETWEEN THE FILTER SHELL AND SAID REMOVABLE CROWN PORTION TO FORM A CLOSED CHAMBER BETWEEN THE FILTER SHELL AND INNER SHELL, THE HELMET BEING PROVIDED WITH AN AIR INLET PASSAGE CONNECTED WITH SAID CHAMBER FOR DELIVERING AIR THERETO FOR FILTRATION THROUGH SAID FILTER SHELL INTO THE OTHER OF SAID AIR SPACES.
References Cited (Backward Citations)
US2029566A
Cited
GB491609A
Cited
US2457554A
Cited
US2855604A
Cited
US3018210A
Cited
US2882894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |