TW349412U - Structure improvement for gas mask - Google Patents
Structure improvement for gas maskInfo
- Publication number
- TW349412U TW349412U TW087206039U TW87206039U TW349412U TW 349412 U TW349412 U TW 349412U TW 087206039 U TW087206039 U TW 087206039U TW 87206039 U TW87206039 U TW 87206039U TW 349412 U TW349412 U TW 349412U
- Authority
- TW
- Taiwan
- Prior art keywords
- structure improvement
- gas mask
- mask
- gas
- improvement
- Prior art date
Links
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW087206039U TW349412U (en) | 1998-04-21 | 1998-04-21 | Structure improvement for gas mask |
TW087206039U TW428481U (en) | 1998-04-21 | 2000-08-15 | Improved structure of gas mask |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW087206039U TW349412U (en) | 1998-04-21 | 1998-04-21 | Structure improvement for gas mask |
Publications (1)
Publication Number | Publication Date |
---|---|
TW349412U true TW349412U (en) | 1999-01-01 |
Family
ID=55537252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW087206039U TW349412U (en) | 1998-04-21 | 1998-04-21 | Structure improvement for gas mask |
Country Status (1)
Country | Link |
---|---|
TW (1) | TW349412U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11877604B2 (en) | 2007-05-03 | 2024-01-23 | 3M Innovative Properties Company | Maintenance-free respirator that has concave portions on opposing sides of mask top section |
US11904191B2 (en) | 2007-05-03 | 2024-02-20 | 3M Innovative Properties Company | Anti-fog respirator |
US12005277B2 (en) | 2013-07-15 | 2024-06-11 | 3M Innovative Properties Company | Respirator having optically active exhalation valve |
-
1998
- 1998-04-21 TW TW087206039U patent/TW349412U/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11877604B2 (en) | 2007-05-03 | 2024-01-23 | 3M Innovative Properties Company | Maintenance-free respirator that has concave portions on opposing sides of mask top section |
US11904191B2 (en) | 2007-05-03 | 2024-02-20 | 3M Innovative Properties Company | Anti-fog respirator |
US12005277B2 (en) | 2013-07-15 | 2024-06-11 | 3M Innovative Properties Company | Respirator having optically active exhalation valve |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4K | Annulment or lapse of a utility model due to non-payment of fees |