Head valve system for air spring power tool
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
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Apr 1, 2025
Grant Date -
Mar 16, 2023
app pub date -
Sep 15, 2021
filing date -
Sep 15, 2021
priority date (Note) -
In Force
status (Latency Note)
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Importance

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Non-US Coverage
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Abstract
A power tool includes an air spring cylinder. A piston is movably positioned within the cylinder. A head valve assembly of the power tool includes a flapper valve configured to seal the air spring cylinder from an air accumulator when the flapper valve is in a non-firing position.
First Claim
all claims..Other Claims data not available
Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
ROBERT BOSCH GMBH | POSTFACH 30 02 20 70442 STUTTGART 70442 | |
ROBERT BOSCH POWER TOOLS GMBH | MAX-LANG-STRASSE 40 – 46 LLEINFELDEN-ECHTERDINGEN 70771 |
International Classification(s)

- 2021 Application Filing Year
- B25C Class
- 124 Applications Filed
- 86 Patents Issued To-Date
- 69.36 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Po, Chien-Kuo | Taichung, TW | 25 | 244 |
# of filed Patents : 25 Total Citations : 244 | |||
Tam, Ramon | Buffalo Grove, US | 21 | 231 |
# of filed Patents : 21 Total Citations : 231 | |||
Wierzchon, Peter | Morton Grove, US | 12 | 42 |
# of filed Patents : 12 Total Citations : 42 |
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Patent Citation Ranking
- 0 Citation Count
- B25C Class
- 0 % this patent is cited more than
- < 1 Age
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- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Oct 1, 2028 |
7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Oct 1, 2032 |
11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 1, 2036 |
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Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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Legal Events
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May 03, 2022 | P | Publication | |
Apr 13, 2022 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
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Feb 15, 2022 | STPP | INFORMATION ON STATUS: PATENT APPLICATION AND GRANTING PROCEDURE IN GENERAL | free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
Oct 21, 2021 | STPP | INFORMATION ON STATUS: PATENT APPLICATION AND GRANTING PROCEDURE IN GENERAL | free format text: NON FINAL ACTION MAILED |
Dec 03, 2019 | STPP | INFORMATION ON STATUS: PATENT APPLICATION AND GRANTING PROCEDURE IN GENERAL | free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
Nov 21, 2019 | P | Published | |
May 20, 2019 | FEPP | FEE PAYMENT PROCEDURE | free format text: ENTITY STATUS SET TO MICRO (ORIGINAL EVENT CODE: MICR); ENTITY STATUS OF PATENT OWNER: MICROENTITY |
May 14, 2019 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CULBERTSON, CHRISTOPHER T.;BOSSMANN, STEFAN H.;SIGNING DATES FROM 20171030 TO 20171113;REEL/FRAME:050351/0258 Owner name: KANSAS STATE UNIVERSITY RESEARCH FOUNDATION, KANSAS free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CULBERTSON, CHRISTOPHER T.;BOSSMANN, STEFAN H.;SIGNING DATES FROM 20171030 TO 20171113;REEL/FRAME:050351/0258 Owner name: KANSAS STATE UNIVERSITY RESEARCH FOUNDATION, KANSA |
May 14, 2019 | FEPP | FEE PAYMENT PROCEDURE | free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: MICROENTITY |
Nov 17, 2017 | F | Filing |

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