Linked Questions

2
votes
2answers
614 views

Expiration date of US5597520 [duplicate]

Can 3DSystems sue Formlabs over US Patent 5597520? If it was issued in 1997, wouldn't it have expired in 2007?
0
votes
1answer
173 views

When does patent US512340 A expire? [duplicate]

My question is, "When will the Tesla Coil patent expire?", What year will it expire?, how soon? and after it expires, will anyone have access to mimick the invention?
0
votes
2answers
167 views

Is this patent expired? [duplicate]

Is the USD388287 S patent expired? I am looking to design something similar to this.
1
vote
1answer
88 views

Is US patent 3611966 still active? [duplicate]

Is US patent 3611966 still valid? If yes, is there any provided expiration date?
0
votes
1answer
99 views

Know that Patent expired or not [duplicate]

I had designed a similar invention like the Patent US5,934,963 but have found this patent was already in force. It seems to have lapsed and been re-instated several times... Can you determine the ...
0
votes
1answer
62 views

Expiration date for patent 5824100 [duplicate]

In reference to the patent: US5824100 What is the expiration date for this patent? Thank you.
0
votes
1answer
59 views

Patent No. USD513117 S1--Is this still a valid patent? [duplicate]

I'm trying to find out if this Patent No. USD513117 S1 is still valid. How can I find out for sure?
0
votes
1answer
42 views

Availability of patent 361, 211 [duplicate]

Is this patent expired or still in use? How do I find out if this design patent is still valid
0
votes
1answer
38 views

Has patent # US6926341 expired due to non-payment? [duplicate]

Has patent #US6926341 expired due to nonpayment?
0
votes
1answer
40 views

Is this patent still legally protected? [duplicate]

In reference to the patent: US3166129
0
votes
1answer
24 views

When does patent US5807360 expire? [duplicate]

In reference to the patent: US5807360
1
vote
0answers
23 views
0
votes
0answers
20 views

Can I make a product which infringes on a patent for my own use..? [duplicate]

In reference to the patent:email id id US1588898 i need to have detailed information about this patent as i wanted to make a project on aerators.
1
vote
0answers
11 views

is this patent time over?..can I continue the work mentioned in it? [duplicate]

In reference to the patent: US6730252
0
votes
0answers
11 views

Can I manufacture US1434590? [duplicate]

In reference to the patent: US1434590 Can I re-invent this somehow? I thought it was an old antique metal ring back in the 1800's. What is the deal with this patent?

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