In the past, when the life of a U.S. patent was 17 years from the date it was granted, submarine patents could issue decades after the initial filing date. Therefore, an applicant for a U.S. patent could benefit by delaying the issuance, and thus expiration date, of a patent through the simple, but relatively costly, expedient of filing a succession of continuation applications. Some submarine patents emerged as much as 40 years after the date of filing of the corresponding application.
During the extended prosecution period the claims of the patent could be modified to more closely match whatever technology or products had become the industry standard.
Prior to changes in US patent law in 1995 and 1999, the content of patent applications was kept secret during the patent approval phase. Currently, the majority of U.S. patent applications are published within 18 months of the filing date (35 U.S.C. 122). However, the applicant can explicitly certify that they do not intend to file a corresponding patent outside the U.S. at the time they file the patent, and keep the application secret. The applicant can change their mind within the first year, but the application is then published. For continuation applications which claim priority to a previously filed application, the publication is six months after the new filing date. The changes to U.S. patent law that introduced publication at 18 months also changed the duration of the patent to 20 years from the filing date of the earliest patent application in any chain of continuation patent applications. As a result, there is little benefit in postponing the grant of the patent. The enforceable life of the patent can no longer be shifted into the period when a technology has become more widely adopted, and the patent applicant must abandon the chance of foreign patent protection if he is to maintain patent secrecy beyond the 18-month period. In a 2006 report the National Academy of Sciences has recommended that "in all cases, applications should be published during patent examinations".
U.S. Committee on the Judiciary, Calendar No. 563, 110th Congress Report, 2d Session, U.S Senate, 110–259, The Patent Reform Act of 2007, January 24, 2008, footnote 112. http://www.patentlyo.com/patent/law/SenateReportonPatentReform.pdf
Gabriel P. Katona, The Myth of Submarine Patents, Pandab online newsletter (August 10, 1998, consulted on March 28, 2010) Archived 2013-04-15 at archive.today http://www.pandab.org/the-myth-of-submarine-patents.html
Gene Quinn, Submarine Patents Alive and Well: Tivo Patents DVR Scheduling, IPWatchdog (February 19, 2010, consulted on March 28, 2010). http://www.ipwatchdog.com/2010/02/19/submarine-patents-alive-and-well-tivo-patents-dvr-scheduling
United States House of Representatives Committee on the Judiciary, Subcommittee on Courts and Intellectual Property, Hon. Howard Coble, North Carolina, Chairman, Hearing on the "21st Century Patent System Improvement Act", H.R. 400, Summary of Testimony of Harold C. Wegner, Professor of Law, George Washington University Law School, retrieved on June 10, 2006 https://web.archive.org/web/20050226113521/http://judiciary.house.gov/legacy/4130.htm
Janine Robben, Son of Invention, Willamette Week Online, August 25, 2004 https://web.archive.org/web/20060627192231/http://www.wweek.com/editorial/3043/5461
Josh Rosenblum, Paying for Patents, Legal Affairs, May/June 2005. Consulted on March 28, 2010. http://www.legalaffairs.org/issues/May-June-2005/argument_rosenblum_mayjun05.msp
[1] Archived February 28, 2009, at the Wayback Machine http://perens.com/Articles/PatentFarming.html
Ozer, Jan (2010-03-04). "Ogg, MPEG LA, and Submarine Patents". Streaming Media Magazine. Retrieved 2011-07-26. http://www.streamingmedia.com/article.asp?id=11746
Paul, Ryan (2009-07-05). "Decoding the HTML 5 video codec debate". Ars Technica. Retrieved 2011-07-26. https://arstechnica.com/open-source/news/2009/07/decoding-the-html-5-video-codec-debate.ars
"Of course, there are a few original patent applications that take decades to issue as well, but this is due to secrecy restrictions, interferences, Board, district court or Federal Circuit appeals. See, e.g., U.S. Patent No. 5,132,080 (an original application was filed November 28, 1944 and the patent was not permitted to issue until July 21, 1992 due to secrecy restrictions); U.S. Patent No. 6,097,812 (filed July 25, 1933 and delayed due to secrecy until August 1, 2000); U.S. Patent No. 6,130,946 (filed October 23, 1936 and delayed due to secrecy until October 10, 2000). Pursuant to 35 U.S.C. §181, the Commissioner of the PTO must withhold the granting of any patent “[w]henever publication or disclosure ... by the grant of a patent on an invention in which the Government has a property interest might, in the opinion of the head of the interested Government agency, be detrimental to the national security.” Id. Although §181 only permits the Commissioner to delay patent issuance for up to one year, the secrecy can be renewed for an unlimited number of one year periods if it is in the interest of national security." in Mark A. Lemley, Kimberly A. Moore, Ending Abuse of Patent Continuations, Boalt Working Papers in Public Law (University of California, Berkeley), Year 2003, Paper 20, page 9, footnote 27. /wiki/Mark_A._Lemley
The National Academies,"Changes Needed to Improve Operation of U.S. Patent System". Archived from the original on February 17, 2006. Retrieved February 17, 2006. https://web.archive.org/web/20060217111758/http://www4.nationalacademies.org/news.nsf/isbn/0309089107?OpenDocument
Flink, p. 51 "Probably the most absurd action in the history of patent law was the granting of United States patent number 549,160 on November 5, 1895, to George B. Selden. a Rochester, New York, patent lawyer and inventor, for an 'improved road engine' powered by 'a liquid-hydrocarbon engine of the compression type'."
Flink, p. 51 "His own patent application was filed in 1879. He then used evasive legal tactics to delay the patent's acceptance until conditions seemed favorable for commercial exploitation."
Borth, Christy. Masters of Mass Production, pp. 38, 152, Bobbs-Merrill Co., Indianapolis, IN, 1945.
Hyatt, Gilbert P., "Single chip integrated circuit computer architecture", Patent 4942516, issued July 17, 1990 https://patents.google.com/patent/US4942516A
"The Gilbert Hyatt Patent". intel4004.com. Federico Faggin. Retrieved 2009-12-23. http://www.intel4004.com/hyatt.htm
Crouch, Dennis (1 July 2007). "Written Description: CAFC Finds Prima Facie Rejection (Hyatt v. Dudas (Fed. Cir. 2007))". Patently-O blog. Retrieved 2009-12-23. http://www.patentlyo.com/patent/2007/07/hyatt-v-dudas-f.html
"Inventor Waits 43 Years for Another Chance to Shock Tech", Feb 24 2014, Bloomberg Business https://www.bloomberg.com/news/articles/2014-02-24/inventor-waits-43-years-for-another-chance-to-shock-tech
W. F. Heinze, Dead Patents Walking, IEEE Spectrum (2002). Consulted on November 26, 2009. https://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=999797
Susan Hansen, Breaking the (Bar) Code, IP Law & Business, March 2004 http://www.ropesgrayhiring.com/images/practice/Breaking_the_Bar_Code.pdf
Susan Hansen, Breaking the (Bar) Code, IP Law & Business, March 2004 http://www.ropesgrayhiring.com/images/practice/Breaking_the_Bar_Code.pdf
United States Court of Appeals for the Federal Circuit, 04-1451, Symbol Technologies, Inc. et al. v. Lemelson Medical, Education & Research Foundation, LP Archived 2010-02-16 at the Wayback Machine, September 9, 2005 http://www.cafc.uscourts.gov/opinions/04-1451.pdf
Appeals Court confirms invalidity of bar code patents, OUT-LAW News, September 12, 2005 http://www.out-law.com/page-6111
United States Court of Appeals for the Federal Circuit, 04-1451, Symbol Technologies, Inc. et al. v. Lemelson Medical, Education & Research Foundation, LP Archived 2009-08-27 at the Wayback Machine, November 16, 2005 http://www.cafc.uscourts.gov/opinions/04-1451o.pdf
The patents at issue are:U.S. patent 4,338,626, U.S. patent 4,511,918, U.S. patent 4,969,038, U.S. patent 4,979,029, U.S. patent 4,984,073, U.S. patent 5,023,714, U.S. patent 5,067,012, U.S. patent 5,119,190, U.S. patent 5,119,205, U.S. patent 5,128,753, U.S. patent 5,144,421, U.S. patent 5,249,045, U.S. patent 5,283,641, U.S. patent 5,351,078. https://patents.google.com/patent/US4338626